Add some traces for shell transition

This includes 3 traces:
1. Create sync group ~ finish
   The duration from transition creation to participants are ready.
2. onTransactionReady
   The duration of preparing TransitionInfo, start/finishTransaction.
3. Tell shell onTransitionReady ~ finishTransition
   The duration of transition animation.

Bug: 211846272
Test: adb shell setprop persist.debug.shell_transit 1; reboot
      Launch an app with "record_android_trace wm".

Change-Id: I0c7cdb98d5c3250c50caf25e147bfe21c1366514