2/ Instrument jank of One-handed mode trigger and exit transition

Add 2 CUJs for one handed mode transition
1. ONE_HANDED_ENTER_TRANSITION
2. ONE_HANDED_EXIT_TRANSITION

- [STATE_ENTERING] Detect swipe down gesture: Begin of enter CUJ
- [STATE_ENTERING] Tap shortcut to trigger: Begin of enter CUJ
- [STATE_ACTIVE] Transition end of enter: End of enter CUJ
- [STATE_EXITING] Detect swipe up gesture: Begin of exit CUJ
- [STATE_EXITING] Tap shortcut to exit: Begin of exit CUJ
- [STATE_NONE] Transition end of exit: End of exit CUJ

Test: see trace in comment
Bug: 201032904
Change-Id: I29258a1bbbe567c935d467621a85fbdfe2397d54