Merge WindowSurfaceController to WindowStateAnimator

The class is only an additional wrapper that is simple enough to
be merged into WindowStateAnimator.

This is a less aggressive removal which keeps original code shape
if possible. There is no behavior change.

Bug: 308662081
Flag: EXEMPT move code
Test: atest WmTests

Change-Id: I8f9319b905d9ce2c9a4a9f7c04eb37547ce252f3