pipeline need support queue management

[sfwn]

What would you like to be added:

You can create any number of queues if you need, and bind one workflow to one queue.
There is a priority between and inside queues. Each queue holds certain resources.

Between queues, queue with large priority number will be scheduled earlier, and workflow inside queue will be scheduled order by workflow's priority number one by one.
Only after all the workflows in the queue with the highest priority are executed successfully, will the workflows in the queue with the second highest priority be executed, and so on.

Why is this needed:

Achieve more fine-grained workflow scheduling.
To a certain extent, more important workflows can be completed with high priority.

[sfwn]

#171
#193