[native] add BottomSheetModalProvider to the root component

Summary:
This diff adds the BottomSheetModalProvider to our tree of providers in the root component. We need to add this provider so we can open up and use the bottom sheet from anywhere in the app

Used the following docs to help me with this implementation:

• https://gorhom.github.io/react-native-bottom-sheet/modal
• https://gorhom.github.io/react-native-bottom-sheet/modal/usage

Test Plan:
Please see demo video below showing that I can present the bottom sheet

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8935