[analyzer] fix for use_key_in_widget_constructors should use super parameters when possible

[asashour]

For a case like:

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  @override
  Widget build(context) => Container();
}

Adding 'key' to consturctor, would produce

const MyWidget({Key? key}) : super(key: key);

which is then offered to "convert to using super parameters".

It would be better to directly use super parameters on adding the 'key'.

Dart SDK version: 2.18.0-75.0.dev (dev) (Sun May 1 14:47:57 2022 -0700) on "windows_x64"

[pq]

Tagging as P1 as use_key_in_widget_constructors is a flutter recommended lint.

[asashour]

https://dart-review.googlesource.com/c/sdk/+/244242

[pq]

Fantastic. Thank you!