Add and update some hotword detection metrics

We use "DETECT_EXCEPTION" in three different places, it is difficult
to distinguish what is realy happening. We use different metrics values
to replace them. And we also add a new metrics value to log onRejected
when the trusted process is restarted.

Android Metrics Design Review : eldar/276723226

Bug: 207717787
Test: build pass
Change-Id: Ib631bac3e5d6663c7eb64f54516b86b7fd9b8144