Add initial editing metrics reporting

This covers only the event for editing ending due to
cancelation/success/failure, and the associated failure code if
applicable. The event also includes a bundle for backwards
compatibility, like all of the other media metrics events.

Bug: 297487694
Test: atest MediaMetricsAtomTests
Change-Id: I032f1d5fe9f2d11ba69d2131bea5ac57b185386f