Enable mouse scrollBehavior on carousel sample

[Jonas Jr]

Steps to reproduce

Open carousel on web:
https://flutter.github.io/samples/web/animations/#/misc/carousel

You can't drag to change images.

would be a good ideia to add mouse as a drag device on PageView in this example?

      scrollBehavior: ScrollConfiguration.of(context).copyWith(
        dragDevices: {
          PointerDeviceKind.touch,
          PointerDeviceKind.mouse,
        },
      ),

[Jonas Jr]

Here is my suggestion may I create a PR?
jonasjuni/samples/blob/patch-1/animations/lib/src/misc/carousel.dart

[Brett Morgan]

Please create a PR and sign the CLA. Thanks!