TF-79 Mark as star/unstar in email detailed view

model/lib/email/important_action.dart

@@ -0,0 +1,5 @@
+
+enum ImportantAction {
+  markStar,
+  unMarkStar
+}

model/lib/extensions/keyword_identifier_extension.dart

@@ -1,5 +1,6 @@
 import 'package:jmap_dart_client/jmap/core/patch_object.dart';
 import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
+import 'package:model/email/important_action.dart';
 import 'package:model/email/read_actions.dart';
 
 extension KeyWordIdentifierExtension on KeyWordIdentifier {
@@ -12,4 +13,10 @@ extension KeyWordIdentifierExtension on KeyWordIdentifier {
       _generatePath(): readActions == ReadActions.markAsRead ? true : null
     });
   }
+
+  PatchObject generateImportantActionPath(ImportantAction importantAction) {
+    return PatchObject({
+      _generatePath(): importantAction == ImportantAction.markStar ? true : null
+    });
+  }
 }

model/lib/model.dart

@@ -25,6 +25,7 @@ export 'email/email_address_cache.dart';
 export 'email/read_actions.dart';
 export 'email/attachment.dart';
 export 'email/move_action.dart';
+export 'email/important_action.dart';
 
 // Extensions
 export 'extensions/email_address_extension.dart';