Set up status bar input layers on init.

Improves performance by caching two status bar input layer views on
init of the view model. This avoids creating and destroying the views
every time a task appears or disappears. Instead of doing that, the
AppHandleViewHolder sets the input layer's position and touch/hover
listeners as needed.

Bug: 369465173
Bug: 369534904
Test: ABTD perf metrics
Flag: com.android.window.flags.enable_handle_input_fix

Change-Id: If9974b363e4787f566167c28f2159495593f87a1