focusTransitionScaleAndDimOut should always go from 1f to 0f

- Also updated AnimatedFloat to accept a Consumer<Float>, so a lambda can be used as updateCallback with refernce to udpated value
- Also updated PendingAnimation to accept Animator with TimedInterpolator without specifying SpringProperty

Fix: 352195519
Test: manual
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c378e64b757dbb83b6024be462a6752bc6a2c5f2)
Merged-In: Ifb78c1bcd3ca215a5d214f986a107d0988bff13b
Change-Id: Ifb78c1bcd3ca215a5d214f986a107d0988bff13b