Add feature of starting a radio based on artist, album, playlist or track (#442)

Add feature of starting a radio based on artist, album, playlist or track (#442)

* Initial implementation of radio feature thoughout the code base
* Implement similar tracks for YT Music
* Implement similar tracks for Spotify

This MVP implementation only provides the radio feature when there is a streaming provider (spotify or YTM) attached to a media item. The frontend will need to be guarded so that radio can not be started if there's no supported streaming provider.

Co-authored-by: Marcel van der Veldt <m.vanderveldt@outlook.com>