Revert "Add new optional beta email parser thats based on ImapEngine instead of Webklex"

This reverts commit 9cb1ff7330.

plugins/vendor/directorytree/imapengine/src/Enums/ImapFlag.php

@@ -1,13 +0,0 @@
-<?php
-
-namespace DirectoryTree\ImapEngine\Enums;
-
-enum ImapFlag: string
-{
-    case Seen = '\Seen';
-    case Draft = '\Draft';
-    case Recent = '\Recent';
-    case Flagged = '\Flagged';
-    case Deleted = '\Deleted';
-    case Answered = '\Answered';
-}