No longer format imports with configurations and a prefix in the wrong order. The parser used to accept this without error even though it violated the language spec. The parser is being fixed, so the formatter will no longer accept or format code like:
```
import 'foo.dart' as prefix if (cond) 'bar.dart';
```
Don't force a space between ? and . if a null-aware element contains a dot shorthand.
Require analyzer: '>=8.2.0 <10.0.0'.
Require args: ^2.5.0.
Require sdk: ^3.9.0.

Respect @dart= version comments when determining which >3.7 style to apply. The formatter correctly used those comments to switch between the old short and new tall style, but ignored them for language versioned style rule changes after 3.7. Now the language version of the file is consistently respected for all style rules (#1762).