[native] add edit avatar button for user avatar

Summary:
Add edit icon badge to user avatar in profile screen, and made user avatar in profile screen a touchable

Design:

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

Reviewers: ashoat, atul

Reviewed By: atul

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7278