List broadcast contacts

curl --request GET \
  --url https://api.zavu.dev/v1/broadcasts/{broadcastId}/contacts \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "id": "<string>",
      "recipient": "<string>",
      "recipientType": "phone",
      "status": "pending",
      "createdAt": "2023-11-07T05:31:56Z",
      "templateVariables": {},
      "messageId": "<string>",
      "errorCode": "<string>",
      "errorMessage": "<string>",
      "cost": 123,
      "processedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "nextCursor": "<string>"
}