Merge "Add WorkspaceRevealAnim, successor to StaggeredWorkspaceAnim." into sc-dev am: 7d4aaaa73d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14523564

Change-Id: Ia237704158133fd5dbf3c9a4d8a77269d12d0b2b