Extract camera tracking into AppCompatCameraStateStrategy.

This change allows refactoring of the way cameraId and app that opened it are tracked (see child CL).

Flag: com.android.window.flags.enable_camera_compat_track_task_and_app_bugfix
Test: atest WmTests:CameraStateMonitorTests
Test: atest WmTests:AppCompatCameraStateStrategyForPackageTests
Bug: 380840084
Change-Id: I38500357f30c7c48b5d5574c25099a4c3556569e