Creates a communications stage

curl --request POST \
  --url https://api.rootly.com/v1/communications/stages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "communications_stages",
    "attributes": {
      "name": "<string>",
      "description": "<string>",
      "position": 123
    }
  }
}'

{
  "data": {
    "id": "18150e10-aa05-489c-bced-79299501849e",
    "type": "communications_stages",
    "attributes": {
      "name": "Investigation Started",
      "slug": "investigation-started",
      "description": "Stage when investigation begins",
      "position": 11,
      "created_at": "2025-10-18T10:24:47.597-07:00",
      "updated_at": "2025-10-18T10:24:47.597-07:00"
    }
  }
}