TAPL: logging incoming intents

Even though ActivityTaskManager already logs intents, logging this will
simplify flake/error investigations that are considered to be too
time-consuming.

Also, this will make it possible in future to programmatically detect
whether the bug is introduced by the system or Launcher.

Bug: 133010698
Change-Id: I7dcadd95baa23f29bb661d6b42280bd2a2f0e099