Make ICSharpRuntimeAnnotationCodeGenerator language-agnostic

[AndriySvyryd]

Try to move ICSharpHelper back to .Design

[AndriySvyryd]

Depends on #25493

[memoria-guy]

Ah, I finally found the issue for this bug! Is there a way to make EF Core code generation work in F# and .NET 6? I am sure there are...well maybe just me that would like to do this :)

[AndriySvyryd]

@memoria-guy It should be possible, see efcore/EFCore.VisualBasic#53
efcore/EFCore.FSharp#112 tracks it for F#