Add Logging of the UI Latency for hotword invocation

Log the UI latency with UIActionLatencyReported atom. We plan to
calulate the latency from when the SoundTrigger HAL emits an event to
when the VoiceInteraction system UI view is shown.

Test: device_config put latency_tracker enabled true; verify traces
and latency is logged in WW.
Bug: 247879896

Change-Id: I3edb91691e81f8f23660c0823a6388338fe926ad