[native] add edit avatar badge to thread avatar

Summary:
add edit avatar badge to thread avatar. Most of this code was ported over from profile-screen.react.js; however, with thread avatars we need to make sure that this badge renders conditonally, since there are some threads where the user should not be allowed to edit thread avatar, whereas a user avatar can always be edited by the user

Depends on D7359

Test Plan:
Please see the screenshots to see the changes I made:

Personal Threads:

Private Thread:

Reviewers: ashoat, atul

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7378