TF-3023 Get SMime signature status in headers email

lib/features/email/presentation/extensions/presentation_email_extension.dart

@@ -0,0 +1,18 @@
+
+import 'package:model/email/presentation_email.dart';
+import 'package:model/extensions/list_email_header_extension.dart';
+import 'package:tmail_ui_user/features/email/presentation/model/smime_signature_status.dart';
+
+extension PresentationEmailExtension on PresentationEmail {
+
+  SMimeSignatureStatus get sMimeStatus {
+    final status = emailHeader?.toSet().sMimeStatus;
+    if (status == 'Good signature') {
+      return SMimeSignatureStatus.goodSignature;
+    } else  if (status == 'Bad signature') {
+      return SMimeSignatureStatus.badSignature;
+    } else {
+      return SMimeSignatureStatus.notSigned;
+    }
+  }
+}

lib/features/email/presentation/model/smime_signature_status.dart

@@ -0,0 +1,5 @@
+enum SMimeSignatureStatus {
+  goodSignature,
+  badSignature,
+  notSigned
+}