Add new APIs
- Margin: getEtfInfo()
- OcoOrder: create(), cancel($orderId), cancelByClientOid($clientOid), cancelMulti($symbol = '', array $orderIds = []), getDetail($orderId),getOrderDetail($orderId),getDetailByClientOid($clientOid),getList(array $params = [], array $pagination = [])
- Order: hfCancelAll()