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.
For reusability an AbstractStoredObjectVoter was created and a StoredObjectVoterInterface.
A WorkflowDocumentService checks whether the StoredObject is involved in a workflow.
A WorkflowDocumentService was created that can be injected\
in context-specific StoredObject voters that need to check whether\
the document in question is attached to a workflow.
