.github: Migrate Markdown issue templates to YAML forms

.github/ISSUE_TEMPLATE/bug-report.yml

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+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2023 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+name: 🪲 Report a bug
+description: >
+  Report a deviation from expected or documented behavior, but not a crash.
+labels: [bug, triage needed]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        This repository hosts the Swift compiler, the Swift standard library,
+        the Swift runtime, SourceKit, and IDE support for the Swift language.
+        It does *not* track feedback on Xcode and other closed source Apple
+        developer software such as SwiftUI and UIKit; please direct it to
+        [Feedback Assistant](https://developer.apple.com/bug-reporting)
+        instead.
+  - type: textarea
+    attributes:
+      label: Description
+      description: >
+        A concise description of what causes the problem, in human language.
+        Though not required, it may help us to more accurately triage the issue
+        as well as understand a non-trivial test case.
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Reproduction
+      description: >
+        Provide a test case, preferably in a Markdown codeblock, and explain
+        how to build or run it to reproduce the problem. If the problem is a
+        poor or unexpected error, warning, fix-it, or output, please show
+        them. Consider reducing the test case to the smallest amount of code
+        possible — a smaller test case is easier to reason about and more
+        appealing to contributors.
+      value: |
+        ```swift
+
+        ```
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: Describe the behavior you expected.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Environment
+      description: >
+        Provide the Swift version, tag, or revision. If you suspect that the
+        problem might be specific to a particular development platform or
+        deployment target, please specify them as well.
+      placeholder: $ swiftc -version
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: >
+        Any complementary information that could help others to work around
+        the problem, and us to better understand the problem and its impact.
+        For example, a link to a discussion or post that motivated this
+        report.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2023 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+blank_issues_enabled: true
+contact_links:
+  - name: 🌐 Discuss an idea
+    url: https://forums.swift.org/c/evolution/discuss
+    about: >
+      Share an idea with the Swift community.
+  - name: 📄 Formally propose a change
+    url: https://www.swift.org/swift-evolution
+    about: >
+      Formally propose an addition, removal, or change to the features of the
+      Swift language or the public interface of the Swift standard library.
+  - name: 🙋 Ask a question about Swift
+    url: https://forums.swift.org/c/swift-users
+    about: >
+      Ask a question about or get help with the Swift language and its standard
+      library. Beginner questions welcome!
+  - name: 🙋 Ask a question about the Swift compiler
+    url: https://forums.swift.org/c/development/compiler
+    about: >
+      Ask a question about or get help with contributing to the Swift compiler.
+  - name: 🙋 Ask a question on the Apple Developer Forums
+    url: https://developer.apple.com/forums
+    about: >
+      Ask a question about or get help with app development for Apple platforms
+      in general. Topics include Xcode and other closed source Apple developer
+      software such as SwiftUI and UIKit.
+  - name: 🪲 Report an issue using Feedback Assistant
+    url: https://developer.apple.com/bug-reporting
+    about: >
+      Report an issue with Xcode or other closed source Apple developer
+      software such as SwiftUI and UIKit.
+  - name: 🪲 Report an issue with The Swift Programming Language (the book)
+    url: https://github.com/apple/swift-book/issues/new/choose
+    about: >
+      Like the Swift compiler and standard library, TSPL is open source and
+      welcomes contributions.
+  - name: 📖 Learn Swift
+    url: https://docs.swift.org/swift-book/documentation/the-swift-programming-language
+    about: >
+      Read The Swift Programming Language, the official book on Swift.

.github/ISSUE_TEMPLATE/crash-report.yml

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+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2023 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+name: 💥 Report a crash
+description: >
+  Report a compiler crash or other unexpected program termination caused by an
+  exception.
+labels: [bug, crash, triage needed]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        This repository hosts the Swift compiler, the Swift standard library,
+        the Swift runtime, SourceKit, and IDE support for the Swift language.
+        It does *not* track feedback on Xcode and other closed source Apple
+        developer software such as SwiftUI and UIKit; please direct it to
+        [Feedback Assistant](https://developer.apple.com/bug-reporting)
+        instead.
+  - type: textarea
+    attributes:
+      label: Description
+      description: >
+        A concise description of what causes the problem, in human language.
+        Though not required, it may help us to more accurately triage the issue
+        as well as understand a non-trivial test case.
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Reproduction
+      description: >
+        Provide a test case, preferably in a Markdown codeblock, and explain
+        how to build or run it to reproduce the problem. Consider reducing the
+        test case to the smallest amount of code possible — a smaller test case
+        is easier to reason about and more appealing to contributors.
+      value: |
+        ```swift
+
+        ```
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Stack dump
+      description: >
+        Paste the stack dump as is, without formatting it into a Markdown
+        codeblock.
+      render: "text"
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: >
+        Describe the behavior you expected instead of the crash.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Environment
+      description: >
+        Provide the Swift version, tag, or revision. If you suspect that the
+        problem might be specific to a particular development platform or
+        deployment target, please specify them as well.
+      placeholder: $ swiftc -version
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: >
+        Any complementary information that could help others to work around
+        the problem, and us to better understand the problem and its impact.
+        For example, a link to a discussion or post that motivated this
+        report.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature-request.yml

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+# This source file is part of the Swift.org open source project
+#
+# Copyright (c) 2023 Apple Inc. and the Swift project authors
+# Licensed under Apache License v2.0 with Runtime Library Exception
+#
+# See https://swift.org/LICENSE.txt for license information
+# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+name: 🌟 Request a change
+description: >
+  Request a feature, improvement, or other change.
+labels: [feature, triage needed]
+body:
+  - type: markdown
+    attributes:
+      value: >
+        This repository hosts the Swift compiler, the Swift standard library,
+        the Swift runtime, SourceKit, and IDE support for the Swift language.
+        It does *not* track feedback on Xcode and other closed source Apple
+        developer software such as SwiftUI and UIKit; please direct it to
+        [Feedback Assistant](https://developer.apple.com/bug-reporting)
+        instead.
+
+        ___
+
+
+        Swift is guided by a community-driven process referred to as the
+        [Swift evolution](https://www.swift.org/swift-evolution)
+        process. Submitting this form is not a guarantee that the request will
+        be considered or implemented. If the request implies an addition,
+        removal, or change to the features of the Swift language or the public
+        interface of the Swift standard library, please consider socializing it
+        on the
+        [Swift forums](https://forums.swift.org/c/evolution/discuss)
+        instead. The Swift forums are the preferred space for sharing ideas and
+        discussing them with the Swift community.
+  - type: textarea
+    attributes:
+      label: Motivation
+      description: >
+        Describe the problems that this idea seeks to address. If the
+        problem is that some common pattern is currently hard to express, show
+        how one can currently get a similar effect and describe its drawbacks.
+        If it's completely new functionality that cannot be emulated, motivate
+        why this new functionality would help create better Swift code or
+        developer tools.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Proposed solution
+      description: >
+        Describe the solution to the problem. Provide examples and describe how
+        they work. Show how this solution is better than current workarounds: is
+        it cleaner, safer, or more efficient?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Alternatives considered
+      description: >
+        Any alternative approaches that were considered, and why the *proposed
+        solution* was chosen instead.
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: >
+        Any complementary information that could be valuable to an author of a
+        formal proposal, an implementor, or future discussions. For example, a
+        link to a discussion or post that motivated this request.
+    validations:
+      required: false