Add hover/press animations to handle.

Adds the following animations:
- Handle grows when hovered over and returns to normal when unhovered.
- Handle shrinks when pressed and returns to normal when released.

Additionally changes the handle size to be in line with spec.

Bug: 314287271
Bug: 329012515
Test: Manual
Change-Id: I50a885fc0ef2603aca0cfc20286b74c2b9753360