Support for custom scheduler

## Question

Thank you for awesome project.
We use Volcano scheduler for ML workload scheduling. Planning to use open simulator for scenarios testing.
Is it possible to use volcano scheduler instead of default kube scheduler?

thank you!!

The issue names no files, tests, or entry points. Start by locating where the simulator selects or invokes the default Kubernetes scheduler and any documented extension points; define done as confirming whether Volcano can be selected and, if supported, documenting or implementing the required integration.

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