[RCP-47] RelatedLookup Resource

The RelatedLookup Resource needs to be ported to the Transport specs.

See attached PDF for original spec.

[RESOWebAPIRCP-RCP - WEBAPI-032  Lookup and RelatedLookup Resources for Lookup Metadata-130424-224129.pdf](https://github.com/RESOStandards/transport/files/14968861/RESOWebAPIRCP-RCP.-.WEBAPI-032.Lookup.and.RelatedLookup.Resources.for.Lookup.Metadata-130424-224129.pdf)
