[AUSM] Create ui tab scoped states + move everything into ui/ subdir

- Removes camel case from ActorUI -> ActorUi
- Moves everything related to AUSM/UI components into a subdir ui/
- Creates tab scoped ui component states under subdir ui/states/

Change-Id: I8bb9e6517db913cc57a37660ebf4b64f8a8bb0cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6676122
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Christine Ying <chrstne@google.com>
Cr-Commit-Position: refs/heads/main@{#1479404}