Add hover states to IconView and TaskThumbnailView in Overview

- Hover over IconView passes to FastBitmapDrawable
- Hover over TaskThumbnailView bounds highlights the border
- Hover over TaskView outside of IconView or Thumbnail does nothing
(previously highlighted a border incorrectly)

Bug: 342594235
Test: OverviewTaskViewHoverImageTest, OverviewDesktopTaskImageTest
Flag: com.android.launcher3.enable_hover_of_child_elements_in_taskview
Change-Id: I5b0753bdec609a4a6658a35422e2823c4ed109fc