Decouple DividerView from SystemUI

Moves FlingAnimationUtils to wm shell library as a common utils for both
wm shell and SystemUI.

There are some basic interpolators needed for wm shell library. Since
they are relative basic and already been put into different packages,
duplicates them directly to wm shell library.

Bug: 161116823
Test: atest SystemUITests
Test: manual check divider animation
Change-Id: Iffabb7eff829cad69ef3d273b803f8fbd3ab6685