Index bar haptic feedback is terrible

Could you improve the haptic feedback for the index bar? It is borderline unusable.
```
indexBarOptions: const IndexBarOptions(
    hapticFeedback: true,
  ),
```

My suggestion is for you to use `HapticFeedback.lightImpact()` from the [haptic_feedback](https://pub.dev/packages/haptic_feedback) package.

Thanks!