fix: Refactor Overlay to be used as containerComponent

[gewfy]

Adds possibility to override the default Overlay container component by making use of containerComponent in BottomSheetModalView as described in #31.

containerComponent has been supported since [email protected] https://github.com/gorhom/react-native-bottom-sheet/releases/tag/v4.4.8

[valdioflorio]

any update on when this can be merged?