Add support to report ART metrics to statsd.

It will report dex2oat related metrics (total time, dex bytes and result
code) after each run of dex2oat.

Bug: 177694884
Test: atest ArtStatsLogUtilsTest
Change-Id: Ic167e250a74e29dee0c8dc628d1cc731d778fa26
Merged-In: Ic167e250a74e29dee0c8dc628d1cc731d778fa26