Basic clock centering transition

This animation is not to spec. Instead this change is primarially
intended to establish the core pattern to use for animating lockscreen
elements between positions within the lockscreen.

To do this we use NestedSceneTransitionLayout to establish nested
subscenes and convert some of relevant Elements to MovableElement to
facilitate movement of android views that would be too complex to
duplicate while the animation is in-progress.

Bug: 418824686
Flag: com.android.systemui.scene_container
Test: Checked view translated between positions as expected
Change-Id: Ie981b36e53220e4107d5194e95899e23ce16ffe0