Get config parameter

{
  "ok": true,
  "result": {
    "@type": "configInfo",
    "config": {
      "@type": "tvm.cell",
      "bytes": "string"
    }
  },
  "@extra": "string"
}

{
  "ok": false,
  "code": 401,
  "error": "API key does not exist"
}

{
  "ok": false,
  "code": 403,
  "error": "Network not allowed"
}

{
  "ok": false,
  "code": 422,
  "error": "failed to parse config_id"
}

{
  "ok": false,
  "code": 429,
  "error": "Ratelimit exceeded"
}

{
  "ok": false,
  "code": 504,
  "error": "LITE_SERVER_NETWORK timeout"
}