List sub-accounts

curl --request GET \
  --url https://api.zavu.dev/v1/sub-accounts \
  --header 'Authorization: Bearer <token>'

{
  "items": [
    {
      "id": "<string>",
      "name": "Client ABC",
      "status": "active",
      "totalSpent": 123,
      "createdAt": "2023-11-07T05:31:56Z",
      "externalId": "<string>",
      "creditLimit": 123,
      "metadata": {},
      "apiKey": "<string>"
    }
  ],
  "nextCursor": "<string>"
}