media, mainline: Add basic AVIF decoding support

This CL contains files that are part of mainline.

Parse the AVIF boxes and pass the data along to a compatible AV1
decoder (similar to how HEIC frames are passed to the HEVC
decoder).

Test: BitmapFactory.decodeByteArray() is now able to decode valid AVIF images.
Test: HEIF related CTS tests still pass.

CTS tests to come in a different CL.

Bug: 141654151

Change-Id: I84a01db859281a1b14746fbb97c247f427d440f8