Changes include class refactoring for Workflow handlers, using `readonly` and better indentation in constructors for better readability. In addition, outdated comments are removed. Also, entity workflow handlers now implement the EntityWorkflowHandlerInterface type for better type safety.
- 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
```
Using the workflow handlers we return the workflow that is attached to an object
so that within the workflowDocumentService we can then check whether this workflow blocks
the edition of a document.
