Add support for liked playlist.

[Gustavo10Destroyer]

I've edited the internal code and added it myself, but please add native support for the liked playlist.

Because using cookies, you can get the whole playlist, I myself started a simple code just to be able to download my whole playlist, because it's something very specific and that no app or program supports.

(YT Music URL)
https://music.youtube.com/playlist?list=LM

[stale]

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