add type (i.e. color) to popconfirm buttons

[wc-matteo]

This function solves the problem (这个功能解决的问题)

I often use popconfirms to confirm a delete operation. It'd be nice if the button inside the popconfirm was red in this case (i.e. type="error"). I know there's the action slot, but it's much more work to setup...

Expected API (期望的 API)

positive-type / negative-type using values from n-button type (default, primary, tertiary, info, success, warning and error)

[07akioni]

How about adding positive-button-props?

[wc-matteo]

even better! :)