Hotword: Add uid into the original metrics

We add new uid filed in HotwordDetectionServiceInitResultReported,
HotwordDetectionServiceRestarted and
HotwordDetectorKeyphraseTriggered. Update the metrics to log it.

Test: statsd_testdrive
Bug: 261793715
Change-Id: Ia49d5981be296c1143074774cc6c00fcc25671e6
Merged-In: Ia49d5981be296c1143074774cc6c00fcc25671e6