KCL doesn't support all keywords when importing from JSON Schema

[anshuishere]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step

Import a KCL Schema from a JSON Schema

kcl import values.schema.json

Where json schema has the following keywords

# If then else statements:

    "pullSecret": {
      "type": ["string", "null"],
      "if": {
        "type": "string"
      },
      "then": {
        "default": "",
        "maxLength": 255
      }
    },

# Keywords like "default" and "type" in ref.

    "podPriority.priorityClassName": {
      "type": "object",
      "properties": {
        "priorityClassName": {
          "$ref": "#/$defs/empty.string"
        }
      }
    }

where
    "empty.string": {
      "type": "string",
      "default": ""
    },

2. What did you expect to see?

KCL can import from non trivial JSON Schema

3. What did you see instead

2025/02/21 14:28:15 genkcl_jsonschema.go:663: [WARN] unsupported keyword: if, path: values.schema/global/pullSecret
2025/02/21 14:28:15 genkcl_jsonschema.go:663: [WARN] unsupported keyword: then, path: values.schema/global/pullSecret
failed to merge ref: unsupported keyword default in ref,
failed to merge ref: unsupported keyword type in ref,

4. What is your KCL components version?

kcl version
0.10.10-linux-amd64