Add testID

[owens-ben]

Feature Request

The testID property should be available as it is in most other RN elements.

Why it is needed

For automated testing where Bottom Sheets are present

Possible implementation

Code sample

<BottomSheetModal ref={bottomSheetModalRef} index={0} testID='bottom-sheet-modal' >

There was already an issue here which I commented on but I don't think that is the right way to get eyes on this.