[5/n] Camera Compat: Toasts explaining compat treatment

Add two toasts explaining compat treatment:
- after the system rotates the screen for camera compatibility
- when a camera view is started within the app that may not be able to display the camera preview correctly while in split screen.

Fix: 255939392
Test: atest WmTests:DisplayRotationCompatPolicyTests
Change-Id: I50d91601ac6e6fb90a626c5496aca60d454ff960