[Compile Time Constant Extraction] Extract Result Builder Expressions

[venkatesh5789]

Added extraction logic for Result Builder syntax. An example of a defined result builder is the following:

@resultBuilder
public enum FooBuilder {
    public typealias Component = [Foo]
    public typealias Expression = Foo

    public static func buildExpression(_ element: Expression) -> Component {
        return [element]
    }

    public static func buildOptional(_ component: Component?) -> Component {
        guard let component = component else {
            return []
        }
        return component
    }

    public static func buildEither(first component: Component) -> Component {
        return component
    }

    public static func buildEither(second component: Component) -> Component {
        return component
    }

    public static func buildArray(_ components: [Component]) -> Component {
        return Array(components.joined())
    }

    public static func buildBlock(_ components: Component...) -> Component {
        return components.flatMap { $0 }
    }
    
    public static func buildLimitedAvailability(_ component: Component) -> Component {
        return component
    }
}

An example usage is the following:

public struct MyFooProviderInferred: FooProvider {
    public static var foos: [Foo] {
        Foo(name: "AAAAAA")
        Foo(name: "BBBBB")

        if someNumber < 3 {
            Foo(name: "Less Than 3")
        } else if someNumber < 7 {
            Foo(name: "Between 3 and 6")
        } else {
            Foo(name: "Between 7 and 10")
        }

        for i in 1...3 {
            Foo(name: "OptionalArrayRange\(i)")
        }

        if (Bool.random()) {
            Foo(name: "Optional")
        }

        if #available(macOS 99, *) {
            Foo(name: "MacOS 99 1")
            Foo(name: "MacOS 99 2")
        } else {
            Foo(name: "Other MacOS")
        }
    }
}

This also supported nested builders. Something like:

public struct MyFooProviderInferred: FooProvider {
    public static var foos: [Foo] {
        Foo(name: "MyFooProviderInferred.foos.1", baz: {
            "Nested.Builder.1"
            "Nested.Builder.2"
        })
        Foo(name: "MyFooProviderInferred.foos.2")
  }
}

[venkatesh5789]

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