Choose between a legacy and a thin screen recording service based on the flag.

Flag: com.android.systemui.thin_screen_recording_service
Bug: 368579013
Test: atest ScreenRecordingServiceInteractorTest
Test: manually on a foldable. Check screen recording with hsum
enabled/disabled.

Change-Id: I2acaeafe2cbe725b17ae42525fa6f0c62f57f533