Add priority queue to HTEX interchange #3727
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Description
Replaces pending_task_queue's queue.Queue() as a SortedList which functions as a priority queue in the interchange. Used to prioritize certain user-labeled tasks when distributing tasks to managers.
Changed Behaviour
Users can now use the parsl_resource_specification keyword in python apps to specify a 'priority'. Lower value is higher priority, tasks with higher priority will be distributed to workers first.
Fixes
Part of #3323 work.
Type of change
Choose which options apply, and delete the ones which do not apply.