Get sub-account list

curl --request GET \
  --url https://api.orderly.org/v1/client/sub_account \
  --header 'orderly-account-id: <orderly-account-id>' \
  --header 'orderly-key: <orderly-key>' \
  --header 'orderly-signature: <orderly-signature>' \
  --header 'orderly-timestamp: <orderly-timestamp>'

{
  "success": true,
  "timestamp": 1702989203989,
  "data": {
    "main_account_id": 123,
    "rows": [
      {
        "sub_account_id": 123,
        "description": "abc"
      }
    ]
  }
}