When missing a `type` field, try to guess the STAC object type

https://developmentseed.org/stac-map/?href=https://csdap.earthdata.nasa.gov/stac/collections/planet doesn't show any `Collection` functionality because the STAC is missing a `type` field. We can probably guess the type from other fields (`summaries`, `extents`) so let's add those heuristics, maybe with a warning?

Start by reproducing the missing Collection functionality at the linked STAC Map URL with the NASA CSDAP collection. Trace where the STAC object type is determined, then inspect how the `summaries` and `extents` fields can identify a Collection. Done means the collection renders its Collection functionality despite the missing `type` field, with warning behavior addressed if appropriate.

Written by the indexing model from the issue text.