Move App Handle back to using Drawable, scale it accordingly for animation.

This CL moves app handle back to being rendered via a drawable, and we will animate
it just directly scaling the drawable in x and y-axis to simulate the spec.

Bug: 314288540
Test: Manual. Open/Close handle menu.
Flag: com.android.window.flags.enable_drawing_app_handle
Change-Id: Id96e44c46c61f851c1da9b1ad247ad1213ed5cde