Produce with String-only JSON Schema fails

[ddavidyuk]

We have the following JSON schema set up for the record keys:

{
  "$schema": "https://json-schema.org/draft/2019-09/schema",
  "type": "string",
  "minLength": 1
}

This describes non-empty strings. When we select this schema in the Key Schema drop-down of the Produce to topic screen and then for the Key enter a quoted string (e.g. "abc" - this conforms to the JSON Schema above), AKHQ fails with an error.

The root cause seems to be that only JSON Objects are expected:
https://github.com/tchiotludo/akhq/blob/dev/src/main/java/org/akhq/modules/schemaregistry/JsonSchemaSerializer.java#L35

Would it be possible to add support for any JSON value, not just JSON Objects?