Support Jellyfin Collections

[Buried-In-Code]

Is your feature request related to a problem? Please describe. Jellyfin UI has the concept of Collections, but Mediux-Posters doesn't update their posters or backdrop.

Describe the solution you'd like Support exists for Plex, so something similar, somehow need to work out how to link the Collection with a TMDB id, in Plex this is done manually with a Label.

Describe alternatives you've considered

Additional context