[automerger skipped] [automerge] Add HotwordMetricsLogger for statistics logging. 2p: b8c2da25 am: bcae1a5f -s ours

am skip reason: Merged-In If436aae1b4ebdb06c7bd5a1c0b8d6df4e94488cd with SHA-1 e13c17d2 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17184397

Change-Id: I2371ed29a142cb420c89321daf4c48c405e130a4