Consolidate split screen rotation in shell transition

1. Prevent updating split layout twice during rotation with
   configuration changed. If the only difference is orientation, it
   means we've handled bounds changes for rotation before, the only
   thing thing left is to make sure divider bar will be rendered
   with proper resources that matching with the new orientation.

2. When handling child task changes, make sure to also update crop if
   it's not sharing the same bounds with its parent.

3. Also exclude adjusting bounds of tasks created-by-organizer while
   display changed, since the organizer created them should handle
   that instead. This is needed to prevent their bounds being rotated
   twice in organizer and wm-core.

Bug: 207185041
Bug: 206487881
Test: atest WMShellUnitTests
Test: enable shell-transition, enter split screen, check the rotation
      behavior of split screen.
Change-Id: I63e4a8566bdc4f3fcad7d4bae59fa23ad03929ac