[Proposal]: Label statements

Label statements

• Specification: https://github.com/dotnet/csharplang/blob/main/proposals/csharp-15.0/labeled-break-continue.md
• Discussion: https://github.com/dotnet/csharplang/discussions/9124

Summary

Labels currently need to be part of statements but can't be statements on their own. We should consider making "Label:" a statement on its own.

Design meetings

• https://github.com/dotnet/csharplang/blob/main/meetings/2022/LDM-2022-02-09.md#label-statements