[PIP][jank] Add jank CUJs for expand transitions

As part of improving jank cuj coverage, add cujs for expanding pip
in PIP2. This also adds PipInteractionHandler which will handle all
other jank CUJ tracking.

Flag: EXEMPT jank
Bug: b/352738878
Test: atest WMShellUnitTests:PipInteractionHandlerTest
Test: Manually check events are being logged
Change-Id: Iad2f4874f199479cfccd35b561c2d223672bc5ea