Provide window visibility of uid without WM lock

The problems:
- ActivityTaskManagerInternal#isUidForeground is called frequently
  from request of bind/start service. It is too heavy to acquire
  WM lock each time.
- The isUidForeground calls isAnyNonToastWindowVisibleForUid. It is
  inefficient to iterate entire window hierarchy. Especially the
  calling uid usually doesn't have a window.

This change:
- Replace isAnyNonToastWindowVisibleForUid with hasActiveVisibleWindow
  that queries VisibleActivityProcessTracker for activity, and
  MirrorActiveUids for non-app (exclude toast) window. The separation
  also makes it simpler to apply special rule to activity window for
  background activity launch restriction in the future.
- Both the container have their own lock so WM lock is not needed for
  ActivityTaskManagerService#hasActiveVisibleWindow.
- To reflect the latest state, if ActivityRecord#mVisibleRequested or
  mVisible is changed, the process and uid state also need be updated.
- Launch a dozen activities after booting. With the same total
  invocation count of isUidForegound, the total time becomes 20~30x
  faster. While the state update time is negligible because the
  structure is very simple and the frequency of change is not high.
- Remove a legacy workaround in WPC#computeProcessActivityState
  that checks whether the activity belongs to the process. Because
  it was fixed by ActivityRecord#detachFromProcess that ensures
  the two-way relation.

Bug: 171490517
Test: WindowStateTests#testHasActiveVisibleWindow
      ActivityStarterTests#testBackgroundActivityStarts*
      ActivityManagerFgsBgStartTest
      BackgroundActivityLaunchTest
Change-Id: Iadca2b79e8971c1a8633e2557f2e8a4184857650