Add exception for FeatureFailure to handle exception in BaseController

core/lib/presentation/state/failure.dart

@@ -2,4 +2,8 @@ import 'package:equatable/equatable.dart';
 
 abstract class Failure extends Equatable {}
 
-abstract class FeatureFailure extends Failure {}
+abstract class FeatureFailure extends Failure {
+  final dynamic exception;
+
+  FeatureFailure({this.exception});
+}