Add an API: when a-cascader clicks the first level option, the second level option automatically slides to the top

[michealiu]

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

What problem does this feature solve?

假设cascader的一级选项对应的二级选项的值有很多，会形成滚动。初始选择一个一级选项，并滑动它的二级选项到最下方之后，重新选择另外一个一级选项，这时它对应的二级选项会默认保持在最下方，需要手动滑回最上方。

What does the proposed API look like?

可以添加一个配置选项，设置为true时，点击一级选项后二级选项自动滑动到最上方

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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

[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

[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.