Daily idle job for writing out brightness events.

Schedule a job for idle + charging to kick off
writing out brighness slider events.
While writing events discard ones outside our
time window.

Bug: 69405990
Test: Manual using adb to kick off job.
Test: runtest -c com.android.server.display.BrightnessTrackerTest frameworks-services
Change-Id: Ibc79d1c80ced26827d6f985bc70ae165df106a42