List all practitioners

curl --request GET \
  --url https://api.caspen.com/v1/practitioners

{
  "data": [
    {
      "id": "<string>",
      "online_booking": true,
      "service_ids": [
        "<string>"
      ],
      "location_ids": [
        "<string>"
      ],
      "provider_numbers": [
        {
          "id": "<string>",
          "location_id": "<string>",
          "type": "<string>",
          "number": "<string>"
        }
      ],
      "created_at": "<string>"
    }
  ],
  "links": {
    "prev": "<string>",
    "next": "<string>"
  }
}