Adding animatingInsetsTypes to InsetsControlTarget

During a hide or show animation, the system might need to know, which insets types are animating.
This CL is a preparation to set the requestedVisibleTypes at the beginning at the hide animation, but avoiding resetting the leash to early.

Fix: 393049691
Flag: android.view.inputmethod.report_animating_insets_types
Test: atest android.view.InsetsControllerTest#testAnimatingTypes
Change-Id: I19643d6cfbf819d207746372264f86cc6768b0df