[Feature Request]级联菜单组件 Cascader 如何选择任意一级

[min82wecv]

What problem does this feature solve?

Cascader 选取任意一级的value。

What does the proposed API look like?

可以直接点击任意一级。

[pangxieju]

设置属性 change-on-select 点任何一级都可以选择。