Allow for multiple marshallers per hotrod client for remote listeners

ISPN-4734 is adding the ability to provide custom marshalling for remote listeners. There is a limation currently that only a single marshaller can be used per client. It may be desirable to allow for multiple marshallers, but we are unsure if the feature is needed. This JIRA is here to make sure this not overlooked. And if it turns out no one uses the custom marshalling we may want to rip it out in this JIRA as well.