[2/3] Create a new motion testing toolkit based on AnimatorTestRule.

This toolkit will allow us to test all Animator and Spring-based motion
using AnimatorTestRule.

Bug: 323863002
Flag: EXEMPT test only
Test: atest AnimatorTestRuleToolkitTest
Change-Id: Id5eb04abe896d6d58920ff3eaf1867e401f2b5ee