change `arguments` to dynamic (roadmap)

- Fixes #441
- I understand `Object` was used, because Flutter's Route arguments uses it. Yet, seems it will not bring any breaking change, beyond removing all type checking to the `arguments` property. So, it gives full freedom (and responsibility) to the developer to make the proper validations.

Check responses in (we might need to validate the usage of extension methods over `dynamic`):
https://stackoverflow.com/questions/31257735/what-is-the-difference-between-dynamic-and-object-in-dart#:~:text=Writing%20dynamic%20o%3B%20declares%20a,except%20that%20it%27s%20an%20Object%20.

@@ -47,7 +47,7 @@ extension GetNavigation on GetInterface {
     Duration duration,
     int id,
     bool fullscreenDialog = false,
-    Object arguments,
+    dynamic arguments,
     Bindings binding,
     bool preventDuplicates = true,
     bool popGesture,
@@ -93,7 +93,7 @@ extension GetNavigation on GetInterface {
   /// Note: Always put a slash on the route ('/page1'), to avoid unnexpected errors
   Future<T> toNamed<T>(
     String page, {
-    Object arguments,
+    dynamic arguments,
     int id,
     bool preventDuplicates = true,
   }) {
@@ -121,7 +121,7 @@ extension GetNavigation on GetInterface {
   /// Note: Always put a slash on the route ('/page1'), to avoid unnexpected errors
   Future<T> offNamed<T>(
     String page, {
-    Object arguments,
+    dynamic arguments,
     int id,
     bool preventDuplicates = true,
   }) {
@@ -197,7 +197,7 @@ extension GetNavigation on GetInterface {
     String page,
     RoutePredicate predicate, {
     int id,
-    Object arguments,
+    dynamic arguments,
   }) {
     return global(id)
         .currentState
@@ -215,8 +215,12 @@ extension GetNavigation on GetInterface {
   /// The `offNamed()` pop a page, and goes to the next. The
   /// `offAndToNamed()` goes to the next page, and removes the previous one.
   /// The route transition animation is different.
-  Future<T> offAndToNamed<T>(String page,
-      {Object arguments, int id, dynamic result}) {
+  Future<T> offAndToNamed<T>(
+    String page, {
+    dynamic arguments,
+    int id,
+    dynamic result,
+  }) {
     return global(id)
         .currentState
         .popAndPushNamed(page, arguments: arguments, result: result);
@@ -255,7 +259,7 @@ extension GetNavigation on GetInterface {
   Future<T> offAllNamed<T>(
     String newRouteName, {
     RoutePredicate predicate,
-    Object arguments,
+    dynamic arguments,
     int id,
   }) {
     return global(id).currentState.pushNamedAndRemoveUntil(
@@ -353,7 +357,7 @@ extension GetNavigation on GetInterface {
     Curve curve,
     bool popGesture,
     int id,
-    Object arguments,
+    dynamic arguments,
     Bindings binding,
     bool fullscreenDialog = false,
     bool preventDuplicates = true,
@@ -413,7 +417,7 @@ extension GetNavigation on GetInterface {
     bool opaque = false,
     bool popGesture,
     int id,
-    Object arguments,
+    dynamic arguments,
     Bindings binding,
     bool fullscreenDialog = false,
     Transition transition,
@@ -968,7 +972,7 @@ extension GetNavigation on GetInterface {
   }
 
   /// give current arguments
-  Object get arguments => routing.args;
+  dynamic get arguments => routing.args;
 
   /// give name from current route
   String get currentRoute => routing.current;

@@ -9,7 +9,7 @@ import '../default_route.dart';
 class Routing {
   String current;
   String previous;
-  Object args;
+  dynamic args;
   String removed;
   Route<dynamic> route;
   bool isBack;
@@ -48,7 +48,7 @@ class GetObserver extends NavigatorObserver {
   bool isDialog;
   String current;
   String previous;
-  Object args;
+  dynamic args;
 
   // String previousArgs;
   String removed;