Coordinate rotation for concurrent mode

1) Adds DisplayRotationCoordinator which is used to coordinate
   default display rotation changes with non-default displays.

2) We now create DeviceStateController in RootWindowContainer and pass
   a single instance to DisplayContent/DisplayRotation. This allows
   for (3) below

3) Adds TestDisplayContent.Builder#setDeviceStateController, which
   allows tests to mock deviceStateController behavior

Bug: 251747141
Bug: 267343444

Test: atest DisplayRotationCoordinatorTests
Test: atest DisplayRotationTests
Test: atest DisplayContentTests
Test: atest DualDisplayAreaGroupPolicyTest
Test: presubmit for other unit tests
Test: manual

Change-Id: Ifae3806079ece87d6d14d09b3025ee19f9c9d226