SDK / exoplayer

I decided not to migrate all the tests in one CL to keep the diff
manageable. I'll make follow-up CLs to migrate the tests, and eventually
delete TeeCodec and all associated logic.

I couldn't completely remove the dump diff because
ShadowMediaCodec.getCodecInfo() (which would give me access to the MIME
type) doesn't seem to work properly - it returned video/avc when
name=exotest.audio.aac, and looking into the code it looks like there's
some native methods that are missing shadow implementations.
PiperOrigin-RevId: 347991956