Statsd notifies listener with pendingintent.

Previously, statsd would inform interested listeners that it's time
to collect data via a protected broadcast. However, the preferred
solution is to pass a PendingIntent via a separate setter. Whenever
statsd wants the listener to call getData, StatsCompanionService
will trigger the pending intent.

Test: Tested in marlin-eng that functionality works as expected with
dogfood app.
Bug: 72562867
Change-Id: Ibcfcd5072a1a78947f8a7cbcd0bc429b54351da3