Feature: [docgen] generate documents in an async queue

The documents are now generated in a queue, using symfony messenger. This queue should be configured:

```yaml
# app/config/messenger.yaml
framework:
    messenger:
        # reset services after consuming messages
        # reset_on_message: true

        failure_transport: failed

        transports:
            # https://symfony.com/doc/current/messenger.html#transport-configuration
            async: '%env(MESSENGER_TRANSPORT_DSN)%'
            priority:
                dsn: '%env(MESSENGER_TRANSPORT_DSN)%'
            failed: 'doctrine://default?queue_name=failed'

        routing:
            # ... other messages
            'Chill\DocGeneratorBundle\Service\Messenger\RequestGenerationMessage': priority
```

`StoredObject`s now have additionnal properties:

* status (pending, failure, ready (by default) ), which explain if the document is generated;
* a generationTrialCounter, which is incremented on each generation trial, which prevent each generation more than 5 times;

The generator computation is moved from the `DocGenTemplateController` to a `Generator` (implementing `GeneratorInterface`. 

There are new methods to `Context` which allow to normalize/denormalize context data to/from a messenger's `Message`.

src/Bundle/ChillPersonBundle/Service/DocGenerator/PersonContext.php

@@ -21,11 +21,13 @@ use Chill\DocStoreBundle\Repository\DocumentCategoryRepository;
 use Chill\DocStoreBundle\Security\Authorization\PersonDocumentVoter;
 use Chill\MainBundle\Entity\Scope;
 use Chill\MainBundle\Form\Type\ScopePickerType;
+use Chill\MainBundle\Repository\ScopeRepositoryInterface;
 use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
 use Chill\MainBundle\Security\Authorization\AuthorizationHelperInterface;
 use Chill\MainBundle\Security\Resolver\CenterResolverManagerInterface;
 use Chill\MainBundle\Templating\TranslatableStringHelperInterface;
 use Chill\PersonBundle\Entity\Person;
+use Chill\PersonBundle\Repository\PersonRepository;
 use DateTime;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\EntityRepository;
@@ -55,6 +57,8 @@ final class PersonContext implements PersonContextInterface
 
     private NormalizerInterface $normalizer;
 
+    private ScopeRepositoryInterface $scopeRepository;
+
     private Security $security;
 
     private bool $showScopes;
@@ -71,6 +75,7 @@ final class PersonContext implements PersonContextInterface
         EntityManagerInterface $em,
         NormalizerInterface $normalizer,
         ParameterBagInterface $parameterBag,
+        ScopeRepositoryInterface $scopeRepository,
         Security $security,
         TranslatorInterface $translator,
         TranslatableStringHelperInterface $translatableStringHelper
@@ -81,6 +86,7 @@ final class PersonContext implements PersonContextInterface
         $this->documentCategoryRepository = $documentCategoryRepository;
         $this->em = $em;
         $this->normalizer = $normalizer;
+        $this->scopeRepository = $scopeRepository;
         $this->security = $security;
         $this->showScopes = $parameterBag->get('chill_main')['acl']['form_show_scopes'];
         $this->translator = $translator;
@@ -211,6 +217,38 @@ final class PersonContext implements PersonContextInterface
         return true;
     }
 
+    /**
+     * @param Person $entity
+     */
+    public function contextGenerationDataNormalize(DocGeneratorTemplate $template, $entity, array $data): array
+    {
+        $scope = $data['scope'] ?? null;
+
+        return [
+            'title' => $data['title'] ?? '',
+            'scope_id' => $scope instanceof Scope ? $scope->getId() : null,
+        ];
+    }
+
+    /**
+     * @param Person $entity
+     */
+    public function contextGenerationDataDenormalize(DocGeneratorTemplate $template, $entity, array $data): array
+    {
+        if (!isset($data['scope'])) {
+            $scope = null;
+        } else {
+            if (null === $scope = $this->scopeRepository->find($data['scope'])) {
+                throw new \UnexpectedValueException('scope not found');
+            }
+        }
+
+        return [
+            'title' => $data['title'] ?? '',
+            'scope' => $scope,
+        ];
+    }
+
     /**
      * @param Person $entity
      */