Gets a list of all of the available place property categories and keys.

{
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "availableKeys": {
        "type": "array",
        "items": {
          "type": "string"
        }
      },
      "category": {
        "type": "string"
      }
    }
  }
}