Update animations for phones: Overview > OverviewSplitSelect transition

This change updates the animation for initiating a split from the Overview screen on phones. Includes new timings and interpolators, and extends timing data classes related to SplitAnimationTimings.

Fixes a noticeable issue where the split animation appeared slow on phones.

Outstanding issues (fixes in progress):
- Repeated invocations of split on phones cause an erroneous animation to play. (b/249154347)
- Thumbnail corners do not match placeholder corners; the transition between the two is slightly janky. (b/236761794)
- Placeholder icons should be 72dp. (b/236761794)

Bug: 236761794
Test: Manual
Change-Id: Ibb97ef54498b0aa9556df531d8084799259c06e2