Updated playlist handling via new custom block or styling existing "core" playlist block

[jeffpaul]

Is your enhancement related to a problem? Please describe.
From @dkotter in #6:

Do we want to style the individual Audio blocks differently? I'd love to have these show up more as a playlist, with song title and artist but currently the Audio block doesn't store that information. This could be a reason to add our own custom block instead of using the core block (otherwise maybe some filtering would be needed)

Describe the solution you'd like
Review the work in #6, the current state of the develop branch, and what approach should (if any) be taken to resolve this issue.

Designs

Describe alternatives you've considered

Additional context

[jeffpaul]

Should review WordPress/gutenberg#805 as well as any other existing, popular "playlist" blocks / block patterns to see what might be the best approach here.