List all studies

{
  "studies": [
    {
      "id": "64b8f0f2e1b1c8a1d2e3f4g5",
      "key": "string",
      "secretKey": "string",
      "status": "string",
      "props": {},
      "configs": {},
      "notificationSubscriptions": [
        {}
      ],
      "stats": {},
      "nextTimerEvent": 0,
      "rules": [
        {}
      ]
    }
  ]
}

{
  "error": "string"
}

{
  "error": "string"
}

{
  "error": "string"
}