Change from mediaanalytics to mediametrics

reflect the change from "media.analytics" to "media.metrics" in
what service names we use; bring the metrics service main code into the
service directory (vs an additional shared library).
Removed references to tentative binder functions that the service
won't be offering, at least not in the near future.

Bug: 34615027
Test: build, boot, new services run, clients talking to said services.
Change-Id: If17772a8f03c05b142e8d5779830d198710210c1