Add QS scrolling support

The brightness slider and tile layout are now a scrollview and
can handle nested scrolling between the views. There is some
black magic which manages the touches to allow a scroll up to
continue into a collapse gesture.

TODO: need to add edge effect colors to theme

Test: visual
Bug: 70799330
Change-Id: Ief0c1480f001cae62175c8ac4f3784daaa0ed2b8