[Proposal]: Label statements

[333fred]

Label statements

• Specification: TBD
• Discussion: [Proposal]: Label statements #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