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

This reverts commit 9cb1ff7330.

plugins/vendor/guzzlehttp/psr7/src/NoSeekStream.php

@@ -1,28 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace GuzzleHttp\Psr7;
-
-use Psr\Http\Message\StreamInterface;
-
-/**
- * Stream decorator that prevents a stream from being seeked.
- */
-final class NoSeekStream implements StreamInterface
-{
-    use StreamDecoratorTrait;
-
-    /** @var StreamInterface */
-    private $stream;
-
-    public function seek($offset, $whence = SEEK_SET): void
-    {
-        throw new \RuntimeException('Cannot seek a NoSeekStream');
-    }
-
-    public function isSeekable(): bool
-    {
-        return false;
-    }
-}