Music streaming functionality

[Akvanvig]

Should be able to search for music/videos and stream audio to voice channels

At the very least to be able to:

• [x] Lookup songs using direct url or name lookup and add to queue
• [x] Stream music
• [x] Queue music
• [x] Skip individual or multiple songs
• [x] Remove last song
• [x] Empty queue
• [x] Disconnect bot

Other nice to haves:

• [x] Add individual songs and playlists to queue (same or different command)
• [ ] Go forward and backwards in songs (10 second default skip? or with with given number of seconds)
• [ ] Change playback speed (f.ex. 1/4x, 1/2x, 2x or 4x speed)
• [x] Change volume (f.ex 1-200 % volume)
• [x] Limit usage to certain users (server based?)
• [ ] Stream from radio station

Tools that might be helpful to implementing features:

• https://github.com/faiface/beep
• https://github.com/ytdl-org/youtube-dl

[MrOctopus]

https://github.com/wader/goutubedl

[MrOctopus]

https://www.reddit.com/r/golang/comments/mh7vza/stream_yt_audio_from_go/

[MrOctopus]

https://github.com/bwmarrin/dgvoice/blob/master/dgvoice.go

[MrOctopus]

We also need to handle forced disconnects (kicks) properly

[MrOctopus]

https://pkg.go.dev/github.com/Vernacular-ai/godub@v0.1.6/audioop

[MrOctopus]

I even added a replay mode!