[native] Create a new screen that will show the role change information

Summary:
This is the screen that contains the information (user avatar, username, role change description and role change options) to allow admins to change roles for a specific user. The navigation and the
header left/right buttons will come in the subsequent diffs to make this one easier to review.

Depends on D8155

Test Plan:
Please see below what the screen looks like for a given user

Reviewers: atul, ginsu

Reviewed By: atul, ginsu

Subscribers: ted, ashoat, tomek

Differential Revision: https://phab.comm.dev/D8156