Support definitions and references ($ref) in JSON Schema validation

[sukeshpabolu]

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Description Facing an exception while validating data with simple json schema. If applicable, a MRE minimal reproduction

[ciscoheat]

This is because definitions and references ($ref properties in the JSON Schema) aren't supported by Superforms. The JSON Schema part needs to be rewritten for this to work. The workaround for now is to resolve the references yourself before using a JSON Schema with the schemasafe adapter.