Update link API for stripes registry

Currently the API for adding and obtaining links to a resource in the registry is very clunky and non-extensible. 

This work will extend that to a Map, similar to the renderFunctions map, complete with a couple of default keys ready to be populated, `viewResource` and `viewResources`.

These need to be relatively locked down at the moment, only taking strings or functions of a set shape. I don't believe that we can validate that very easily, so documentation will suffice in comments and on the Wiki