public ForumTopic (
ForumTopicInfo info,
Message? last_message,
int64 order,
bool is_pinned,
int32 unread_count,
int64 last_read_inbox_message_id,
int64 last_read_outbox_message_id,
int32 unread_mention_count,
int32 unread_reaction_count,
ChatNotificationSettings notification_settings,
DraftMessage? draft_message)