text: Title: Feature request: Support for Django form validation
  Body: Hey,
  is there any possibility to add some support for the Django form validation by also returning the field parameters via GraphQL? What I was thinking of is something like this which takes whatever is defined in the model and passes it to the frontend so that I'd be possible to create some auto-validation based on the backend.
  
  ```json
  User {
    "firstname": {
      "value": "James",
      "validation": {
        "type": "String",
        "max_length": 30
      }
    }
  }
  ```