[FEATURE] Download single song from YouTube

[Verryx-02]

Problem:

It's common to find songs on YouTube that aren't on Spotify or YouTubeMusic.
The fact that these songs can't be downloaded makes this tool incomplete.

Possible Solution:

Add a command to download a single song from YouTube.
It could be saved in a playlist used only for songs downloaded that way.
You could try to extract the little metadata available.
I don't know how to handle syncing yet.

Phases Involved

• PHASE 1 - Spotify metadata fetching
• PHASE 2 - YouTube Music matching
• PHASE 3 - Audio downloading
• PHASE 4 - Lyrics fetching
• PHASE 5 - Metadata embedding
• Other / Not sure

Additional Context