feat: add resizeBegin && resizeEnd Functions

[iwpz]

maybe u have to format codes again.

[iwpz]

with resizeBegin && resizeEnd, you can use resizable_widget in a scrollView.
First put it into a scrollView, and make a bool canPageScroll = true;

 physics: canPageScroll ? ScrollPhysics() : NeverScrollableScrollPhysics(),

Then you can

  onResizeBegin: (index, details) {
    setState(() {
      canPageScroll = false;
    });
  },
  onResizeEnd: (index, details) {
    setState(() {
      canPageScroll = true;
    });
  },

And about details, I think maybe someone may need some points to add some handler, just like me :)