Delegate full granule query to earthaccess, keep smart subsetting logic in icepyx

[weiji14]

To reduce the confusion of ICESat-2 users in choosing whether to use icepyx or earthaccess to search for ATLAS products, this issue attempts to discuss a path forward to have proper separation of concerns in both libraries. Talking to @JessicaS11 and others at the 2024 UW Hackweek, we propose to change the 'search' workflow to:

1. For 80% of the users who wants an easy entrypoint -> Delegate full granule search and download to earthaccess. Specifically use earthaccess to return the Granule IDs from the NSDIC DAAC, and connect/open that (ideally cloud-hosted) dataset via fsspec.
2. For 20% of the users who want to do more advanced search -> Use earthaccess to look for the Granule IDs, and icepyx (as a plugin/extension) handles the smart open_subset logic.
   • a) Transition phase icepyx=v1.x - Have the variable subsetting logic remain in icepyx only, without integration into earthaccess. Users use this interface with a mix of earthaccess and icepyx
   • b) Breaking phase icepyx=v2.x - Allow users to install icepyx as an extension of earthaccess. Users will interface directly using earthaccess.smart_open, xref Develop a plugin interface to add new downloaders nsidc/earthaccess#328.

Taking a stab this week as part of ICESAT-2HackWeek#5

[mfisher87]

💯

[weiji14]

Implementation-wise, I'm gonna try to increase code coverage on query.py and granules.py in #581 first, and then refactor ipx.Query's internal logic to use earthaccess's functions/methods to get the granule list. Intent is to try to retain backwards compatibility as much as possible in icepyx=1.x, and then make any breaking changes in icepyx=2.x.