Expand query ability to define linking

[dylanratcliffe]

When we execute a query we should be able to determine the depth at which we want to find linked items. Sometimes we will only want the one item but in other scenarios we might want to find all linked items. A query should be able to specify this.

Also the cache should be able to handle this. i.e. Items should be cached before linking (with LinkedItemRequests still attached) so that we can change the linking depth later and the cache still works