Feature request: Add Rate Limiter

[purplescorpion1]

Feature description

Related to #2162 - Requests to sync each show are being sent too fast cause a rate limit exceeded error
Add into config an option to set the timeout between each requests in seconds for plextraktsync.queue.TraktBatchWorker.add_to_collection()

Use case

Adding a timeout between sending requests should allow requests to succeed without triggering the rate limit exceeded error

Workarounds

Unknown

Plan to implement

I don't know your code well enough to look into it
Someone needs to update code so the rate limit is not triggered

[glensc]

Rate limit is already implemented