media: add EncoderProfiles

EncoderProfiles is an extension to CamcorderProfile where multiple video
and or audio profiles can be listed for a given quality level. Also, it
can be generalized to non-camera related profiles, such as transcoding
in the future.

Bug: 171673898
Test: atest CamcorderProfileTest
Change-Id: If39337f7c8bc6c3b9cb771dd321976ce3c8a66ef