TF-56 Send email with attachment

lib/features/composer/domain/state/send_email_state.dart

@@ -1,5 +1,12 @@
 import 'package:core/core.dart';
 
+class SendingEmailState extends UIState {
+  SendingEmailState();
+
+  @override
+  List<Object?> get props => [];
+}
+
 class SendEmailSuccess extends UIState {
 
   SendEmailSuccess();