Refactor workflow classes and forms

- the workflow controller add a context to each transition;
- the state of the entity workflow is applyied using a dedicated marking store
- the method EntityWorkflow::step use the context to associate the new step with the future destination user, cc users and email. This makes the step consistent at every step.
- this allow to remove some logic which was processed in eventSubscribers,
- as counterpart, each workflow must specify a dedicated marking_store:

```yaml
framework:
    workflows:
        vendee_internal:
            # ...
            marking_store:
                service: Chill\MainBundle\Workflow\EntityWorkflowMarkingStore
```

src/Bundle/ChillMainBundle/Controller/WorkflowController.php

@@ -22,6 +22,7 @@ use Chill\MainBundle\Repository\Workflow\EntityWorkflowRepository;
 use Chill\MainBundle\Security\Authorization\EntityWorkflowVoter;
 use Chill\MainBundle\Security\ChillSecurity;
 use Chill\MainBundle\Workflow\EntityWorkflowManager;
+use Chill\MainBundle\Workflow\WorkflowTransitionContextDTO;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\Form\Extension\Core\Type\FormType;
@@ -279,7 +280,7 @@ class WorkflowController extends AbstractController
 
         if (\count($workflow->getEnabledTransitions($entityWorkflow)) > 0) {
             // possible transition
-
+            $stepDTO = new WorkflowTransitionContextDTO($entityWorkflow);
             $usersInvolved = $entityWorkflow->getUsersInvolved();
             $currentUserFound = array_search($this->security->getUser(), $usersInvolved, true);
 
@@ -289,9 +290,8 @@ class WorkflowController extends AbstractController
 
             $transitionForm = $this->createForm(
                 WorkflowStepType::class,
-                $entityWorkflow->getCurrentStep(),
+                $stepDTO,
                 [
-                    'transition' => true,
                     'entity_workflow' => $entityWorkflow,
                     'suggested_users' => $usersInvolved,
                 ]
@@ -310,12 +310,7 @@ class WorkflowController extends AbstractController
                     throw $this->createAccessDeniedException(sprintf("not allowed to apply transition {$transition}: %s", implode(', ', $msgs)));
                 }
 
-                // TODO symfony 5: add those "future" on context ($workflow->apply($entityWorkflow, $transition, $context)
-                $entityWorkflow->futureCcUsers = $transitionForm['future_cc_users']->getData() ?? [];
-                $entityWorkflow->futureDestUsers = $transitionForm['future_dest_users']->getData() ?? [];
-                $entityWorkflow->futureDestEmails = $transitionForm['future_dest_emails']->getData() ?? [];
-
-                $workflow->apply($entityWorkflow, $transition);
+                $workflow->apply($entityWorkflow, $transition, ['context' => $stepDTO]);
 
                 $this->entityManager->flush();