select下拉框自定义为级联选择时，选中后输入框值改变

[CLJLewis]

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

What problem does this feature solve?

select下拉框自定义为级联选择时，比如有三级，选择第一级时，输入框值变成value1，接着选择第二级时，输入框值变成value1/value2，到第三级时，变成value1/value2/value3，且以tags形式显示在输入框中

What does the proposed API look like?

跟原本select的API差不多，可以加多个inputValue 显示选中时输入框的值

[tangjinzhou]

你可以使用 cascader 组件

[github-actions]

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