Implement AudioSampleEntryV1

[rillian]

There is a new version of the AudioSampleEntry which allows specifying samplerates over 65 kHz. This is apparently uncommon, with current encoders relying on codec override of the container metadata, but we should probably support it for the sake of flac/modern profiles.

[baumanj]

See ISO/IEC 14496-12:2015 § 12.2.3.2 for details on the box and https://trac.ffmpeg.org/ticket/6609 for additional supporting info.

[baumanj]

This would be a nice-to-have, but it's not a high priority for us currently. Submissions are welcome, but lacking that this is unlikely to be addressed in the near term.