feat(yt/watch/playlist_handler): Rewrite to use new db layout

The previous iteration actually worked with the mpv playlist, which
proved very bug prone as mpv does not store our costume video, but the
loaded cache path. Besides this, the old handler stored everything in
memory, resulting in a full playback reset on restart.

This new version uses the db to store the playlist and the playback
progress and simply synchronizes this playlist with mpv.

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