Add skip ahead and chapter control on Android Auto

[Lau-ie]

The android app works pretty well on Android auto, but skip 10s ahead and chapter control are disabled in the interface. It's actually pretty annoying if I read the hardcopy and need to skip ahead a couple chapters. Can those controls be made active?

[advplyr]

I couldn't find any documentation to implement this. Overall the Android Auto developer experience has been poor. If you or anyone finds any info on how to do this it would be appreciated, I also use this feature a lot.

[yourjelly]

Before I made the comment in discord I tried looking for documentation of implementation, but was disappointed with what little I could find

[AwsomeFox]

Added another request for control options https://github.com/advplyr/audiobookshelf-app/issues/333

Also since it was discussed in the pr I think the order of the custom android auto playback options is dependent on the order they're added in code. I can't find any docs to support this but 🤷

[advplyr]

Jump forward/backward buttons are added. Chapter control should be working for audiobooks with multiple mp3s but not yet working for single file m4b. v0.9.57-beta