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/routing/Matcher/ExpressionLanguageProvider.php

@@ -0,0 +1,58 @@
+<?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\Routing\Matcher;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+use Symfony\Contracts\Service\ServiceProviderInterface;
+
+/**
+ * Exposes functions defined in the request context to route conditions.
+ *
+ * @author Ahmed TAILOULOUTE <ahmed.tailouloute@gmail.com>
+ */
+class ExpressionLanguageProvider implements ExpressionFunctionProviderInterface
+{
+    private $functions;
+
+    public function __construct(ServiceProviderInterface $functions)
+    {
+        $this->functions = $functions;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFunctions()
+    {
+        $functions = [];
+
+        foreach ($this->functions->getProvidedServices() as $function => $type) {
+            $functions[] = new ExpressionFunction(
+                $function,
+                static function (...$args) use ($function) {
+                    return sprintf('($context->getParameter(\'_functions\')->get(%s)(%s))', var_export($function, true), implode(', ', $args));
+                },
+                function ($values, ...$args) use ($function) {
+                    return $values['context']->getParameter('_functions')->get($function)(...$args);
+                }
+            );
+        }
+
+        return $functions;
+    }
+
+    public function get(string $function): callable
+    {
+        return $this->functions->get($function);
+    }
+}