Add cached state to prevent blocking calls from SysUI->Shell

- WindowManagerGlobal has a shared lock which means that code in the
  shell main thread can deadlock with code running on the sysui main
  thread in rare cases (ie. display changes when folding/unfolding).

  Ideally there are no blocking calls between SysUI/Shell so this
  change caches state changes from the Bubbles side for querying from
  SysUI.  In particular, the expanded states and the suppressed states.

Bug: 190453559
Test: atest SystemUITests


Change-Id: I4e60b168a84618033604e7d097599b048a5886a1