Create an audience attribute

curl --request POST \
  --url https://your_a2_service/audiences/attributes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>",
  "name": "<string>",
  "owner_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z",
  "description": "<string>",
  "updated_at": "2023-11-07T05:31:56Z"
}
'

{
  "code": "<string>",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "no": 123,
  "owner_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "value_count": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "description": "<string>",
  "updated_at": "2023-11-07T05:31:56Z"
}