[public-api] Add envvar proto file

[jeanp413]

Description

Split it from #19067

Summary generated by Copilot

🤖[deprecated] Generated by Copilot at 087445d

This pull request adds the EnvironmentVariableService, which is a new service for managing user and configuration environment variables, to the public API. It also adds the generated code for the service in Go and TypeScript, using the Connect protocol. The service is defined in the envvar.proto file, and the generated code is in the envvar.connect.go, envvar.proxy.connect.go, and envvar_connect.ts files.

Related Issue(s)

Fixes #

How to test

Documentation

Preview status

gitpod:summary

Build Options

Build

• /werft with-werft
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• leeway-no-cache
• /werft no-test
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Publish

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Installer

• analytics=segment
• with-dedicated-emulation
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Preview Environment / Integration Tests

• /werft with-local-preview
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• /werft with-preview
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• with-integration-tests=all
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• with-monitoring

/hold