[Feature] Provide feature gates for KubeRay experimental features

[Jeffwan]

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

Description

Reliability becomes more and more important especially Kuberay is being advertised from upstream ray.

Recently we add a few features like ingress support, autoscaler support, autoscaler race condition improvement (reconciler logic refactor) which may brings uncertainty and hurt the reliability. What we like to need is a global feature gate which cane be a set of key=value pairs that describe the KubeRay features.

A related topic is whether we like to have different stage like alpha, beta for these versions. I personally feel that might be a little bit heavy for this project but worth discussion.

Use case

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Related issues

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Are you willing to submit a PR?

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