Adding functionality for mails to be unread when moved to spam.

Rebasing

(cherry picked from commit 4a907520bc0b53ff42cb7d6cde40771a649629f5)

model/lib/extensions/mailbox_id_extension.dart

@@ -1,6 +1,8 @@
 import 'package:jmap_dart_client/jmap/core/patch_object.dart';
 import 'package:jmap_dart_client/jmap/core/reference_id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
+import 'package:model/extensions/keyword_identifier_extension.dart';
 
 extension MailboxIdExtension on MailboxId {
   String generatePath() {
@@ -24,5 +26,13 @@ extension MailboxIdExtension on MailboxId {
     });
   }
 
+  PatchObject generateMoveToSpamActionPath(MailboxId currentMailboxId, MailboxId spamMailboxId) {
+    return PatchObject({
+      currentMailboxId.generatePath():  null,
+      spamMailboxId.generatePath(): true,
+      KeyWordIdentifier.emailSeen.generatePath(): true
+    });
+  }
+
   String get asString => id.value;
 }