migration symfony 5 4 (#300)

* symfony 5.4 (diff dev)

* symfony 5.4 (working)

* symfony 5.4 (update autoload)

* symfony 5.4 (remove swiftmailer mailer implementation)

* symfony 5.4 (php doc and split Global accessor class)


### Impacted packages:

composer require php:">=7.2.5 <8.0.0" symfony/console:5.4.* symfony/dotenv:5.4.* symfony/framework-bundle:5.4.* symfony/twig-bundle:5.4.* symfony/yaml:5.4.* --update-with-dependencies

composer require symfony/stopwatch:5.4.* symfony/web-profiler-bundle:5.4.* --dev --update-with-dependencies

lib/symfony/http-foundation/RateLimiter/AbstractRequestRateLimiter.php

@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\RateLimiter;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\RateLimiter\LimiterInterface;
+use Symfony\Component\RateLimiter\Policy\NoLimiter;
+use Symfony\Component\RateLimiter\RateLimit;
+
+/**
+ * An implementation of RequestRateLimiterInterface that
+ * fits most use-cases.
+ *
+ * @author Wouter de Jong <wouter@wouterj.nl>
+ */
+abstract class AbstractRequestRateLimiter implements RequestRateLimiterInterface
+{
+    public function consume(Request $request): RateLimit
+    {
+        $limiters = $this->getLimiters($request);
+        if (0 === \count($limiters)) {
+            $limiters = [new NoLimiter()];
+        }
+
+        $minimalRateLimit = null;
+        foreach ($limiters as $limiter) {
+            $rateLimit = $limiter->consume(1);
+
+            if (null === $minimalRateLimit || $rateLimit->getRemainingTokens() < $minimalRateLimit->getRemainingTokens()) {
+                $minimalRateLimit = $rateLimit;
+            }
+        }
+
+        return $minimalRateLimit;
+    }
+
+    public function reset(Request $request): void
+    {
+        foreach ($this->getLimiters($request) as $limiter) {
+            $limiter->reset();
+        }
+    }
+
+    /**
+     * @return LimiterInterface[] a set of limiters using keys extracted from the request
+     */
+    abstract protected function getLimiters(Request $request): array;
+}