Consider adding the possibility to unwrap a result with a switch statement

[Lucartas]

Hello,

the idea is to be able to write something like this:

Result<String> getSomethingPretty() {
  if(isOk) {
    return 'OK!'.toSuccess();
  } else {
     return Exception('Not Ok!').toFailure();
  }
}

void main() {
  final result = getSomethingPretty();
  switch(result) {
      case Success():
          print("${result.success}");
          break;
      case Error():
        print("${result.error}");
        break;
  }
}