表格组件 components配置自定义header

[lihuabest]

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What problem does this feature solve?

table components配置，在自定义header里返回子元素信息

const components = {
        header: {
                cell: (prop, children) => {
                    // children参数目前返回的是一个slots，v2版本里返回的是一个子元素数组；希望增加参数把子元素数据渲染数据返回出来
                }
        }
}

What does the proposed API look like?

const components = { header: { cell: (prop, children， childrenNode) => {

    }
 }

}