[Feature] 支持直接拖动列头进行列排序

[SamChan1204]

What problem does this feature solve?

目前必须先点击列头选中列，才能拖动列头进行列排序。希望可以支持直接拖动，简化操作。

20260206-154838.mp4

What does the proposed API look like?

{
    dragOrder: {
        dragImmediately: true
    }
}