[native] Add expand button for drawer elemennts

Summary:
Linear issue: https://linear.app/comm/issue/ENG-1881/community-navigation-drawer-on-native
In the comments on this issue it has been decided that we'll use the icons from FontAwesome.

Test Plan: Tested with subsequent diffs. I also tested it by displaying it in RelationshipListItem instead of the PencilIcon.

Reviewers: tomek, atul, ginsu, kamil, bartek

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D5718