Thoughts on PopupMenu and CupertinoContextMenu、BottomSheet and CupertinoActionSheet

[bookshiyi]

I did not carefully examine the feasibility of the code architecture, but simply considered the appearance of the control and the similarity of the usage scenario.

Widget	on Material	on Cupertino
PlatformPopupMenu	PopupMenu	CupertinoContextMenu
PlatformBottomSheet	BottomSheet	CupertinoActionSheet

Is this a feasible plan, or do others have better ideas?

Thanks~