Improve MediaProvider event metrics

Rename MediaProvider metric atoms to past tense verbs.

In addition, slightly change what is logged in MEDIA_CONTENT_DELETED
and MEDIA_PROVIDER_PERMISSION_REQUESTED. The changes are:
1. Log app UID instead of app name. However, in Logging#logPersistent we
still log package name.
2. Don't log timestamp (because WW already does that).

Test: manual
Bug: 149669087
Bug: 153160314
Change-Id: I39fd666802d42bce0b079277a13e0ca0f2b72f1f
4 files changed