Scoped #nowarn

[Martin521]

Description

This is a draft PR (WiP) for a scoped #nowarn.

Checklist

• implementation for impl files
• draft RFC
• implementation for sig files
• check if scripts are covered
• handle #line directives correctly
• warning for empty or non-matching #warnon
• handle #line directives correctly, part 2
• implementation for background compiler
• implementation of relaxation of placement rules for the directives
• RFC proposal, creation of discussion thread
• RFC discussions and changes, possibly implementation changes, RFC approval and merge
• Release notes
• Review

[github-actions]

❗ Release notes required

@Martin521,

Caution

No release notes found for the changed paths (see table below).

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* <Informative description>. ([PR #XXXXX](https://github.com/dotnet/fsharp/pull/XXXXX))

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/9.0.100.md	No release notes found or release notes format is not correct
LanguageFeatures.fsi	docs/release-notes/.Language/preview.md	No release notes found or release notes format is not correct