Add a new campaign item to a campaign

curl --request POST \
  --url https://api.starleads.co/CampaignItem/{campaignId} \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <x-api-key>' \
  --data '{
  "phoneNumber": "<string>",
  "dataBag": {},
  "nextTryDate": "<string>"
}'

{
  "id": "<string>",
  "campaignId": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "processedAt": "2023-11-07T05:31:56Z",
  "lastCallDate": "2023-11-07T05:31:56Z",
  "runningStatus": "Pending",
  "attemptCount": 123,
  "phoneNumber": "<string>",
  "nextTryDate": "2023-11-07T05:31:56Z",
  "dataBag": {},
  "result": {
    "tag": {
      "id": "<string>",
      "name": "<string>",
      "color": "<string>"
    },
    "conversation": {
      "id": "<string>",
      "messages": [
        {
          "timestamp": "2023-11-07T05:31:56Z",
          "role": "<string>",
          "text": "<string>",
          "intent": "<string>"
        }
      ]
    },
    "summary": "<string>",
    "isSystem": true,
    "metadata": {}
  },
  "isArchived": true,
  "eventList": [
    {
      "type": "LaunchCall",
      "date": "2023-11-07T05:31:56Z",
      "description": "<string>"
    }
  ]
}