Add customs accessibility actions to snooze, allow it to be focused

- Add plumbing for accessibility action IDs, enabling custom
  accessibility options in the local context menu
- Allow snooze view to be focusable
- When option is selected announces the selection via window state change

Test: manual
Bug: 34840333
Change-Id: Idca0b0e00e792d3e3f71fc6a15b9b26d9136f6da