[native] Show Roles option in community action sheet
Summary:
In the community action sheet, we want to introduce a 'Roles' option that will navigate to a screen listing all of the community roles and respective member counts. Since that involves navigation, the action key/value will come later, and this just shows the option in the action sheet (the entire stack will be landed together, so this won't be an issue).
Depends on D8332
Test Plan:
Confirm that a 'Roles' option appears for those who have permissions to change roles, and it should not appear if otherwise.
Reviewers: atul, ginsu
Reviewed By: atul
Subscribers: ted, ashoat, tomek
Differential Revision: https://phab.comm.dev/D8333