Add switch autocomplete on enum

[tolotrasamuel]

In Android Studio, Dart does not compile if a switch is used on an enum and some clause are missing.
Though I do not see why should that trigger a fatal compiler error, (Why not just skip missing clause) one would intuitively place the cursor on the error and press the keys: ALT+ENTER but nothing happens.

I suggest a feature that auto-generate all missing clause with an empty: break statement or just not consider this a fatal compiler error at all.

[lrhn]

It makes sense to have a fix to remove the error. Just adding default: break; is likely not sufficient :)

(See #36127 for the ongoing discussion about whether this should be a warning or error. The fix makes sense in either case).

[bwilkerson]

https://dart-review.googlesource.com/c/sdk/+/97780