Updating the scroll calculation from recyclerView to avoid view inflation

> Updating the LayoutManager's scroll calculation instead of a separate
  implementation to better support recyclerView's calculations
> Caching the view sizes during layout to avoid view-inflation for
  unknown types
> Fixing scrollbar jump during scroll when widget list is expanded
> Fixing scrollbar never reaching end when onboarding card is displayed
  in work tab

Bug: 240343082
Test: Verified on device that new views are not inflated
Change-Id: Ied11ccf65b053691c5c126c4bf8de306ec24786d

src/com/android/launcher3/allapps/FloatingHeaderView.java

@@ -68,7 +68,7 @@ public class FloatingHeaderView extends LinearLayout implements
                         mAnimator.cancel();
                     }
 
-                    int current = -mCurrentRV.getCurrentScrollY();
+                    int current = -mCurrentRV.computeVerticalScrollOffset();
                     boolean headerCollapsed = mHeaderCollapsed;
                     moved(current);
                     applyVerticalMove();