feat(bloc_layout): add attributs available for grid bloc layouts

packages/wyatt_bloc_layout/lib/src/core/mixins/gird_view_mixin.dart

@@ -20,11 +20,16 @@ import 'package:wyatt_bloc_layout/wyatt_bloc_layout.dart';
 mixin GridLayoutMixin<SuccessType extends Object?> {
   Widget gridChild(BuildContext context, SuccessType? successType);
 
+  double get verticalGap => 30;
+  double get horizontalGap => 30;
+
   Widget successBuilder(
     BuildContext context,
     CrudListLoaded<SuccessType> state,
   ) =>
       GridLayout(
+        verticalGap: verticalGap,
+        horizontalGap: horizontalGap,
         children: state.data.map((e) => gridChild(context, e)).toList(),
       );
 }