[native] Introduce CommunityCreationContentContainer component

Summary:
This component was heavily inspired by RegistrationContentContainer.

Replaced the ScrollView in RegistrationContentContainer with a View to avoid issue with virtualized list being nested within ScrollView:

Kept all the other styling and whatnot for consistency.

As with RegistrationContentContainer, this component can probably be made more general, "added to the design system," and moved to /components in the future. Will discuss how to approach this w/ @ted when he's back.

Depends on D8056

Test Plan: Things look as they did before and the RedBox no longer appears when the screen renders.

Reviewers: ashoat, ginsu

Reviewed By: ashoat

Subscribers: tomek, ted

Differential Revision: https://phab.comm.dev/D8057