增删查改组件嵌套无法拖拽排序

#### 描述问题：

增删查改组件嵌套无法拖拽排序 ,子节点行的id,前端发送数据缺失

#### 如何复现：

查看示例程序,
https://aisuda.bce.baidu.com/amis/examples/crud/nested?page=1

通过浏览器调试, 发现前端发送的数据,只包含顶级数据行的id,不包括嵌套行id

Start with the nested CRUD example at https://aisuda.bce.baidu.com/amis/examples/crud/nested?page=1 and inspect the browser request produced by drag sorting. Compare the top-level and child-row IDs in the payload. Done means nested rows can be reordered and their IDs are included in the request.

Written by the indexing model from the issue text.