Sort named constructor parameters alphabetically

[ikurek]

Some classes like {{ClientOptions}} or {{TokenDetails}} use named constructor parameters, but currently they're not put in any logical order. It may be good to keep named parameters of constructors in a specific order, for example sorted alphabetically. This would add some consistency across the codebase

I've checked if there's a lint rule available for that, but there doesn't seem to be any static analysis solution available

[QuintinWillison]

I wonder if we could write our own linter for this. 🤔

[ikurek]

@QuintinWillison Sadly, Dart linter doesn't support custom rules yet, there's a really long discussion about that here dart-lang/linter#697. We would need to write the linter from scratch 😞