[native, lib] Move community drawer related code that can be reused on web from native to lib

Summary: Some code used for community drawer on native can be reused for community drawer on web, so I moved it to lib.

Test Plan: run iOS simulator, checked that communinty drawer works as expected.

Reviewers: ginsu, przemek, michal, tomek

Reviewed By: przemek, tomek

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D6156