[Request] schedule cache updates based on expiry time

[djay]

Is your feature request related to a problem? Please describe.
We already predict the expiry time so no need to wait until playback or refresh to update teh cache.

Describe the solution you'd like
Change the queue to a priority queue based on expiry. Process based on now updates or if expired.

Describe alternatives you've considered
Set up a period schedule that reevaluates the predictions but this is wasteful

Additional context

• should also try to optimise the predictions as some are too short