Creates FormField Positions

curl --request POST \
  --url https://api.rootly.com/v1/form_fields/{form_field_id}/positions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "form_field_positions",
    "attributes": {
      "form_field_id": "<string>",
      "form": "web_new_incident_form",
      "position": 123
    }
  }
}
'

{
  "data": {
    "id": "cbaedd00-abce-4d93-adf5-96387e424b21",
    "type": "form_field_positions",
    "attributes": {
      "form_field_id": "238212be-ae5c-4c82-9fe1-734dd19f7e68",
      "form": "web_new_incident_form",
      "position": 2
    }
  }
}