Add "JSON Schema Check" to Rule_Type.json schema file

[ASL-rmarshall]

Please add the following to the Rule_Type.json:

    {
      "const": "JSON Schema Check",
      "title": "Apply JSON schema validation to a JSON file"
    },

To keep the file alphabetical, it should be inserted above the JSONata entry.

[ASL-rmarshall]

@alexfurmenkov We forgot to do this for the #715 updates