feature #28400 [Messenger] Add a simple serializer (fabpot)

This PR was merged into the 4.2-dev branch.

Discussion
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[Messenger] Add a simple serializer

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | #...

When using the Messenger component without Symfony full stack, it helps to use a simple Serializer configured with the bare minimum (this bare minimum is up to the discussion).

Commits
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f27c15a493 [Messenger] added a simple serializer

src/Symfony/Component/Messenger/Transport/Serialization/Serializer.php

@@ -13,6 +13,10 @@ namespace Symfony\Component\Messenger\Transport\Serialization;
 
 use Symfony\Component\Messenger\Envelope;
 use Symfony\Component\Messenger\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Encoder\JsonEncoder;
+use Symfony\Component\Serializer\Encoder\XmlEncoder;
+use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+use Symfony\Component\Serializer\Serializer as SymfonySerializer;
 use Symfony\Component\Serializer\SerializerInterface;
 
 /**
@@ -31,6 +35,15 @@ class Serializer implements DecoderInterface, EncoderInterface
         $this->context = $context;
     }
 
+    public static function create(): self
+    {
+        $encoders = array(new XmlEncoder(), new JsonEncoder());
+        $normalizers = array(new ObjectNormalizer());
+        $serializer = new SymfonySerializer($normalizers, $encoders);
+
+        return new self($serializer);
+    }
+
     /**
      * {@inheritdoc}
      */