Links inference

[vincentsarago]

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 stac-utils/stac-fastapi#472