Table中支持expand时，不展示前面的加号

[ensignwy]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

配置了expandedRowRender时，能不能加个参数，不默认展示前面的加号?

What does the proposed API look like?

ant-design 已经实现了该功能expandIconAsCell={false} expandIconColumnIndex={-1}，希望ant-design-vue也能实现这个功能

[sendya]

https://codesandbox.io/s/antd-vue-table-expico-vewww

[hminghe]

标记一下。

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[heboliufengjie]

https://codesandbox.io/s/antd-vue-table-expico-vewww

great!

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.