Get all contact groups

Example response

{
  "data": [
    {
      "id": "123",
      "name": "Operations Team",
      "email_addresses": [
        "johnsmith@example.com",
        "janesmith@example.com"
      ],
      "integrations": [
        "1",
        "2",
        "3"
      ],
      "mobile_numbers": [
        "447712345678",
        "447987462344"
      ],
      "ping_url": "https://www.example.com/notifications"
    }
  ],
  "metadata": {
    "page": 1,
    "per_page": 25,
    "page_count": 10,
    "total_count": 230
  }
}