[Proposal]: u8 string interpolation

[333fred]

u8 string interpolation

• Specification: TBD
• Discussion: [Proposal]: u8 string interpolation #9120

Summary

Allow u8 strings to be used with interpolation when the target handler has an AppendLiteral(ReadOnlySpan<byte>) method.

Design meetings

• https://github.com/dotnet/csharplang/blob/main/meetings/2023/LDM-2023-10-16.md#u8-string-interpolation