Save Playlist

[hyblocker]

Is your feature request related to a usage problem (not a bug)? Please describe.
The ability to save playlists seems to be missing. I'd like to save playlists in order to watch them later. If the feature is implemented the means to save a playlist should be better communicated to the end user.

Describe the solution you'd like to see implemented
A simple and clear button to save playlists

Describe alternatives you've considered
Saving videos is a workaround but playlists tend to get updated, defeating the purpose, and on the other hand, saving a playlist's videos manually is cumbersome

Screenshots
N/A

Additional context

[GilgusMaximus]

Duplicate of #312