[web] Add expand buttons
Summary:
Add buttons to be used in community drawer to expand items.
Related issue
The same buttons on native : D5718
Test Plan: Displayed buttons in AppSwitcher, checked that they display as expected and onClick works
Reviewers: przemek, michal, ginsu, tomek
Reviewed By: przemek, tomek
Subscribers: ashoat, tomek, atul
Differential Revision: https://phab.comm.dev/D6158