C#13 Escape Character (`\e`)

[ds5678]

dotnet/csharplang#7400

I'd like to implement support for this as a way to get my feet wet with decompilation that depends on the language version.

[siegfriedpammer]

Hmm... I think this one is a bit tricky because it is the first language feature that would need configuration of our TextWriterTokenWriter. I am not sure whether the usefulness of this feature warrants the implementation complexity of an option in that part of the API. Usually we just exclude such features by marking them as "won't do" / crossing them out.