Add support for YouTube channels

[javdc]

Is your feature request related to a problem? Please describe.
Currently when you try to play a YouTube channel an error is thrown (Load failed, Unknown file format.)

Describe the solution you'd like
Support for adding all videos from a YT channel to the queue

Additional context
It's easy to implement, it seems YouTube has a playlist with all videos for every channel. To obtain it, we have to follow these steps:

1. Get the ID from the channel (accesible from the URL)
2. Replace the prefix UC with UU
3. Put the replaced ID in the URL https://www.youtube.com/playlist?list={playlistId}

For example, for the channel https://www.youtube.com/channel/UCuAXFkgsw1L7xaCfnd5JJOw the playlist with all videos would be https://www.youtube.com/playlist?list=UUuAXFkgsw1L7xaCfnd5JJOw

[Wikijito7]

This may stop working in the near future as every channel URL is being migrated from the original id identifier to @\whatever. For example, following your URL, it will be transformed to https://youtube.com/@rickastleyyt at some point (on mobile is already that way)