## Description

Adds some convenience methods to `KeyEvent` that allow testing to see if a logical or physical key is pressed from the event object. These are similar to the ones already on `RawKeyEvent`, and will make migration the to `KeyEvent` easier (so it could more easily be a `flutter fix` migration).

Added:

- `bool isLogicalKeyPressed(LogicalKeyboardKey key)`
- `bool isPhysicalKeyPressed(PhysicalKeyboardKey key)`
- `bool get isControlPressed`
- `bool get isShiftPressed`
- `bool get isAltPressed`
- `bool get isMetaPressed`

## Related Issues
 - https://github.com/flutter/flutter/issues/136419

## Tests
 - Added tests for the new methods.