[Feature] [API Server] Allow autoscaling in python api server client

[smit-kiri]

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• [X] I had searched in the issues and found no similar feature requirement.

Description

I see that API Server does support autoscaling, but that is unavailable in python api server client.

It would be very useful to add this capability

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!

[kevin85421]

cc @tedhtchang @blublinsky @z103cb

[blublinsky]

Oh yes, Cluster spec is missing:

    "enableInTreeAutoscaling": true,
    "autoscalerOptions": {
        "upscalingMode": "Default",
        "idleTimeoutSeconds": 30,
        "cpu": "500m",
        "memory": "512Mi"
    },

parameters. Can get to it in a couple of weeks

[anyscalesam]

OK to assign to you @blublinsky to track next step?

[blublinsky]

Sure, but I need my current PR to be merged first. It has been sitting there for several months now