TF-3294 Fix BLUE-BAR mail to attendees duplicated recipients

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

@@ -0,0 +1,12 @@
+
+import 'package:jmap_dart_client/jmap/mail/calendar/properties/attendee/calendar_attendee.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
+
+extension CalendarAttendeeExtension on CalendarAttendee {
+  EmailAddress toEmailAddress() {
+    return EmailAddress(
+      name?.name,
+      mailto?.mailAddress.value,
+    );
+  }
+}

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

@@ -0,0 +1,12 @@
+
+import 'package:jmap_dart_client/jmap/mail/calendar/properties/calendar_organizer.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
+
+extension CalendarOrganizerExtension on CalendarOrganizer {
+  EmailAddress toEmailAddress() {
+    return EmailAddress(
+       name,
+       mailto?.value,
+    );
+  }
+}