(<a-table>) The table title should provide the help manual

[Dylan-lijl]

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

What problem does this feature solve?

当用户不知道当前列的代表的含义但是却没有提示方式

What does the proposed API look like?

提供help字段来显示帮助信息
实现方式:
1.(加?图标)表格标题旁边添加一个?图标,当用户点击弹出帮助信息或者悬浮显示帮助信息,例子: id name ? age note
2.(不加任何方式)使用单击或双击表头项弹出或悬浮帮助信息

[tangjinzhou]

使用 headerCell 插槽自定义

[github-actions]

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