Add Utility method in userCache to get badgeDrawables

- In userCache, create a utility method to get badgeDrawables via userHandle. As of this moment, this is used in Toast.

Bug: 312898415
Test: Manual photos:
before 0-state: https://drive.google.com/file/d/15OUcd8i1IoUU0BgMlZj-8e0YWsmtzY4E/view?usp=sharing
after 0-state: https://drive.google.com/file/d/15SH19xvdLzQt1QbHY2oAxPAFVXPZDchF/view?usp=sharing
before textHeader: https://drive.google.com/file/d/15OLpN2SNF9QNWMrs0Aos5fS-l39Op-wo/view?usp=sharing
after textHeader: https://drive.google.com/file/d/15PIi-K6FfdCtPwWg2GEP9SUE5ow2YXJ5/view?usp=sharing
Flags: None

Change-Id: Ia6f89e634cc0af47cae91add6ea62d3af452c441