[native] Introduce useIsAppForegrounded

Summary: Introduce useIsAppForegrounded hook. This will be changed in upcoming diffs as foreground:boolean is updated to lifecycleState: LifecycleState.

Test Plan: The updated components work as expected on iOS and android.

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, subnub

Differential Revision: https://phabricator.ashoat.com/D870