Support for MaterialApp.router

[alexobviously]

It would be nice to be able to use the NeumorphicApp widget with MaterialApp.router and navigator 2.0. Some sort of NeumorphicApp.router constructor would be good.

[MrKnos]

Fixed at this PR (waiting for merge).

or use it by adding below in pubspec.yaml.

dependency_overrides:
  flutter_neumorphic:
    git:
      url: git@github.com:MrKnos/Flutter-Neumorphic.git
      ref: feature/neumorphic-app-router

[Fanom2813]

Kindly add routerConfig to support import 'package:go_router/go_router.dart';