Client method to sync playlist content efficiently using multible api calls.

[blueforesticarus]

Is your feature request related to a problem? Please describe. I am working on a program which synchronizes spotify playlists. For this I often need to make the content of a playlist equal to a list of tracks. Similar issue to #296.

Describe the solution you'd like A client function that replaces the content of a playlist with a list of tracks. (using the minimum number of inserts and deletes).

Describe alternatives you've considered You can of course clear the playlist and add all the tracks, but for large playlists it is very slow as only 100 items can be added per API call. This could reasonably mean 30+ api calls, even when you are only adding/deleting a few things.

Additional context I actually already have to write this logic (I am porting this function from this project).

Is this something you would be interested in me upstreaming?

[blueforesticarus]

This is essentially the logic part btw https://github.com/blueforesticarus/goontunes2/commit/034994bffbe3270ab9e812ac981e22c43c25d7cd

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