[IMPROVEMENT] Concurrent BackingImage creation limit Per Node

[Jack Lin]

Is your improvement request related to a feature? Please describe (👍 if you like this request)

To limit the BackingImage creation computing usage
We should limit the concurrent BackingImage creation number per node.

Describe the solution you'd like

Add a global setting for limiting the concurrent BackingImage creation number.

Describe alternatives you've considered

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Additional context

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cc @innobead @shuo-wu