Return a "results" class instead of a a plain list

[jhkennedy]

I've closed #860 and pushed that forked-branch here so that we can more easily collaborate on this feature -- just point PRs to this branch and we'll work on finishing the feature here.

@ebolch @JessicaS11

fixes #847

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📚 Documentation preview 📚: https://earthaccess--898.org.readthedocs.build/en/898/

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