[Feature Request] Dont add duplicate songs

[Vrtox]

Is your feature request related to a problem? Please describe.

When you add multiple playlists with some songs overlapping the songs get added twice (or even more often)

What is your ideal solution to the problem?

Dont add a song if it is already in the queue

How would this feature be used?

1. Add one playlist
2. Add second playlist
3. Only songs who are not already in the queue are getting added

Additional Info

No response

Checklist

• [X] I have checked the documentation to make sure this feature doesn't already exist
• [X] I have searched for similar feature requests
• [X] I have confirmed that my requests is not on the list of things that will not be added
• [X] I am running the latest version of the bot:

[MichailiK]

Possibly related to #1165, as this could be introduced as a queue type