Allow customizing `CarouselView` in `ThemeData`

### Use case

I don't want to do this:
```dart
                shape: const RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(
                        Radius.circular(UiGlobal.carouselBorderRadius))),
```
every time I create an instance of CarouselView

### Proposal

Please add `carouselView` parameter to `ThemeData`