Links inference

So with #32 we split the OGC Features and Tiles Factories, in the `/` landing pages we are still getting links for Features and Tiles services when using the unified `Endpoints` factories but within each **collections** links we don't have links to the `Tiles` endpoints (because we have no easy ways to know if there is a tiles/ endpoint within the same route or application (well we could find some way but we'll prefer a more `general` solution).

I think the idea is to be able to infer any links within Collection and/or Items, by maybe following something like what Jeff did in https://github.com/stac-utils/stac-fastapi/pull/472