Create contacts for a campaign

curl --request POST \
  --url https://api.voxia.ai/campaigns/{campaignId}/contacts \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '[
  {
    "name": "<string>",
    "phoneNumber": "<string>",
    "data": {},
    "archived": false
  }
]'

{
  "status": "success",
  "data": {
    "requested": 123,
    "added": 123,
    "modified": 123,
    "contactIds": [
      "<string>"
    ]
  }
}