UDS to return Collection as top level instead of FeatureCollection for /collections/[collection ID]

[ngachung]

Include also /items in links array for collection

[wphyojpl]

This endpoint won't be a search. It will just return a single collection based on its ID.

[wphyojpl]

If we want it backward compatible,

• /collections return Feature collection of collections.
  • /collections can also return a catalog which breaks backward compatibility. But it might needs a pagination. I'm not sure how that would work with stac browser.
• /collections/{id} return a Collection