Add Add priority queue to HTEX interchange v4 #3848
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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. If no priority is given, tasks default to the lowest priority and the FIFO queue behavior of the original queue.Queue() is retained.
Fixes
Part of #3323, reverts changes in #3750
Type of change
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