add java_api_finder plugin to mainline module Media to generate java APIs used by Media.

Bug: 129294170
Test: m updatable-media RUN_ERROR_PRONE=true |& tee media_error_prone.out
Change-Id: I3cdfe5e00394c6ff7b9c857f63a5e45ac79f8d24
(cherry picked from commit 6eff1d43)
Merged-In: I3cdfe5e00394c6ff7b9c857f63a5e45ac79f8d24