Merge "Add the DefaultItemAnimator, without change animations" into sc-dev am: d9abe11b92 am: 5bb331df92

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14736372

Change-Id: Idedb0647c81e750cd523652bc191fbe47a6c2096