Pass the primary node type for a new node to the connector when creating an identifier

When a client adds a new node and that node happens to be in a federated area of the repository, then ModeShape asks the connector to generate a new identifier for the new node via the newDocumentId(...) method. Currently, the parent ID and the new node's name are passed to this method, but the new node's primary type is also known at this time (and is actually the only other piece of information known about the new node) and should be passed down in the newDocumentId(...) method.

See the discussion on MODE-1772.