Enhance fulfiller details sub resource to allow updating accession number of an order

The RESTful fulfiller details endpoint allows a downstream fulfiller to update the fulfiller status and fulfiller comments.

We'd like to expand this endpoint so that it also allows setting the accession number of an order.

In TRUNK-5739 we will be expanding the underlying the service method this resource uses to be able to update the accession number.

Once that is complete, we should create a new FulfillerStatus2_3 endpoint that extends the current endpoint to take of this new functionality.