[21/n] Create Infrastructure for reachability

Create methods to create and start a
WindowContainerTransaction to hadle reachability
animations.

Flag: com.android.window.flags.app_compat_refactoring
Bug: 377874638
Bug: 377875801
Test: atest WmTests:WindowContainerTransactionTests

Change-Id: Iff8a8428207b713d2869ea24fdeb89ec6ea3d3cc