Flicker Scenarios: MediaProjection

Adding necessary framework for Flicker scenarios which set up and tear down a screen sharing scenario (entire screen and single app)

Bug: 348585793
Bug: 348585794
Bug: 348585796
Flag: TEST_ONLY
Test: atest ShareAppOpenFourApps.kt
Test: atest ShareAppOpenFourAppsRsizeAndDrag.kt
Test: atest ShareScreenOpenFourApps.kt
Change-Id: I6e9cf39cc71f6a3513d13bcfcd3df9c1ca408fe1