Introducing ConfigurationContainerListener

Class provides a structured way for window containers on the window
manager side to listener for configuration changes happening in the
window controllers on the activity manager side so things stay in
sync and they don't miss anything.

Test: bit FrameworksServicesTests:com.android.server.wm.WindowContainerControllerTests
Test: bit FrameworksServicesTests:com.android.server.wm.ConfigurationContainerTests
Test: go/wm-smoke
Change-Id: I6a6bc98a35bda89b3aaa7a29a9814905f0c3a9ee