Add queue length estimation

[PhoenixTwoFive]

Add estimated waiting time for all (admn) or on (participant) entries

[PhoenixTwoFive]

As the required data is not part of the data provided by Karaoqueue, this would require grabbing this information from some other service.

Probably usable APIs:

• https://www.theaudiodb.com/api_guide.php
• https://www.discogs.com/developers/

Not so usable:

• MusicBrainz (Focus around whole releases, can't request singular track information)