Create a conversation assignment

curl --request POST \
  --url https://app.kapso.ai/api/v1/whatsapp_conversations/{whatsapp_conversation_id}/conversation_assignments \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '{
  "conversation_assignment": {
    "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "notes": "<string>"
  }
}'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "active": true,
    "notes": "<string>",
    "created_at": "2023-11-07T05:31:56Z",
    "created_by_user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}