Disable detailed transition logs but add a summary.

On slow devices, logcat actually takes a lot of time, so turn it
off by default.

To maintain usefulness, though, add back some critical logging
by recording important information during the transition and then
logging a summary at critical points (startTransition and finish).

Since the logging itself is deferred, we can put it on a low-
priority thread so it doesn't impact latency.

Bug: 260059642
Test: Run android-go latency tests and observe significant
      improvement
Change-Id: I3621747f4d80a66953bda038dfc2c411dffa067d