Introduce Switch.padding (#149884)
fixes [Switch has some padding that leads to uncentered UI](https://github.com/flutter/flutter/issues/148498)
### Code sample
<details>
<summary>expand to view the code sample</summary>
```dart
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
ColoredBox(
color: Colors.amber,
child: Switch(
padding: EdgeInsets.zero,
value: true,
materialTapTargetSize: MaterialTapTargetSize.padded,
onChanged: (bool value) {},
),
),
const SizedBox(height: 16),
ColoredBox(
color: Colors.amber,
child: Switch(
value: true,
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
onChanged: (bool value) {},
),
),
],
),
),
),
);
}
}
```
</details>
### Default Switch size
<img width="476" alt="Screenshot 2024-07-11 at 13 25 05" src="https://github.com/flutter/flutter/assets/48603081/f9f3f6c6-443d-4bd5-81d4-5e314554b032">
### Update Switch size using the new `Switch.padding` to address [Switch has some padding that leads to uncentered UI](https://github.com/flutter/flutter/issues/148498)
<img width="476" alt="Screenshot 2024-07-11 at 13 24 40" src="https://github.com/flutter/flutter/assets/48603081/aea0717b-e852-4b8d-b703-c8c4999d4863">
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