Cascader supports server search

[dingshaohua-com]

loadData 与 showSearch 一起使用。

Version

3.0.0-alpha.14

Steps to reproduce

使用Cascader 插件就会有这个问题，官方已经说明了，不支持
为此，我封装了个组件，使用很简单https://www.npmjs.com/package/server-search-cascader

[github-actions]

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