Make Some APIs in CommandQueue aware of multi-display (3/N)

By this CL, we could dispatch Callback to fragments on the specified
display. I also add some annotations for documenting.

TODO: 1. add tests for multi-display.
      2. make registerStatusBar be an IStatusBar API to propagate the
         information when a display is added or in the initial step.
      3. Introduce AutoHideController

Test: atest SystemUiTests
Bug: 117478341

Change-Id: I864600f929c1d0c8aa39274f30c17b213b754d86