Add item sessions endpoint

[rasmuslos]

This endpoint allows API clients to request listing sessions for specific items. A possible use case for this would be to show the listing session of an audiobook on its page.

[advplyr]

I doubt this would fulfill that FR because even pausing long enough isn't going to end the session. Sessions in Abs need to be refactored to handle that better. I guess it could be useful to see sessions for a specific audiobook but I don't think it will provide much use for tracking. The Abs android app has that feature and it is all tracked internally. It hasn't been added to the iOS app yet advplyr/audiobookshelf-app#466.

[advplyr]

Sorry for the quick review, not much time today. Pointed out a few things

[rasmuslos]

I doubt this would fulfill that FR because even pausing long enough isn't going to end the session. Sessions in Abs need to be refactored to handle that better. I guess it could be useful to see sessions for a specific audiobook but I don't think it will provide much use for tracking. The Abs android app has that feature and it is all tracked internally. It hasn't been added to the iOS app yet advplyr/audiobookshelf-app#466.

I think it's better than nothing and having play / pause show up is not really necessary (in my opinion). Also clients could just close the active listing session after x minutes of inactivity.

[advplyr]

Thanks!