Retrieves a FormFieldPosition

curl --request GET \
  --url https://api.rootly.com/v1/form_field_positions/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "a6d9746f-5d00-452c-8c43-aeaab75d2dc8",
    "type": "form_field_positions",
    "attributes": {
      "form_field_id": "13b9c559-143c-48e1-9445-b179af719dda",
      "form": "web_update_incident_form",
      "position": 1
    }
  }
}