[Feature] rayStartParams UX improvement

[kevin85421]

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

Description

Currently, RayStartParams (code) is defined as a map[string]string in KubeRay. If users wish to set up a parameter in JSON format, they need to perform some unconventional transformations. For example,

• Invalid config

  "system-config": "{\"object_spilling_config\": \"{\\\"type\\\": \\\"filesystem\\\", \\\"params\\\": {\\\"direcory_path\\\": \\\"/efs/Wbenv38/WR8q1a20\\\"}}\"}"

• Valid config

  '\'{"object_spilling_config": "{\\"type\\": \\"filesystem\\", \\"params\\": {\\"direcory_path\\": \\"/data\\"}}"}\'',

We should consider improving the UX, but we should also need to consider backward compatibility. If it will make most YAMLs incompatible, we should not break the compatibility and update the document instead.

• [ ] Update doc
• [ ] Improve UX

Use case

No response

Related issues

No response

Are you willing to submit a PR?

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

[kevin85421]

@rueian will take this issue.