Add itemRender slot to the a-Cascade component

[2292777095]

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

What problem does this feature solve?

Custom rendering of a-Cascade options is possible

What does the proposed API look like?

itemRender: slot | (recore: any) => vnode

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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[bot]]

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.