Implements loading variable length packets from CSV

[jmbhughes]

Purpose

Add support for loading variable length packets from CSV, resolving #115

Packet array shaped can be defined in the data type as uint(expand) for expanding fields or uint(OPMODE) for a reference type, where OPMODE is another field.

Changes to codebase

• added some new example CSVs to load as variable length packets
• renamed the existing CSVs to reflect the new "basic" versus "extended" nomenclature
• added and used _parse_csv_array_shape to handle the more complicated array shape logic
• added test for when _parse_csv_array_shape should fail
• added test to confirm proper parsing of array_shape
• added test to confirm variable length packets load from CSV
• updated the documentation to reflect these changes
• required pytest no be less than version 8.1.0

Todos

• resolve failing CI
• add test for failure cases to make codecov happy
• unpin pytest version since it appears plugin issue is resolved with new release

Notes

I think I've implemented all the expected features. I haven't tested extensively, so I can add some more tests if you think it's appropriate. As always, I'm open to suggestions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (1522816) to head (c6e4fbf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   96.05%   96.10%   +0.04%     
==========================================
  Files           7        7              
  Lines         710      719       +9     
==========================================
+ Hits          682      691       +9     
  Misses         28       28              

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[jmbhughes]

@ddasilva the CI failing seems to be because of the release of pytest 8.1.0 a few hours ago and plugins not having updated releases to match necessary changes, namely pytest-filter-subpackages(pytest-dev/pytest#11779). You can see the last release of pytest-filter-subpackages was in 2022. It looks like a release is under consideration. The simplest solution for now is to not allow pytest 8.1.0 in the CI, but there may be better options.

[ddasilva]

@ddasilva the CI failing seems to be because of the release of pytest 8.1.0 a few hours ago and plugins not having updated releases to match necessary changes, namely pytest-filter-subpackages(pytest-dev/pytest#11779). You can see the last release of pytest-filter-subpackages was in 2022. It looks like a release is under consideration. The simplest solution for now is to not allow pytest 8.1.0 in the CI, but there may be better options.

Totally reasonable. Feel free to edit your branch to pin a version of pytest and repush. It would be on this line:
https://github.com/CCSDSPy/ccsdspy/blob/main/pyproject.toml#L36

[ddasilva]

@ehsteve Feel free to comment

[ddasilva]

I pinged a few of our collaborators over email from Europa Clipper / MMS / Canadian Space Agency to get their thoughts on this new feature. Even if they don't have much to say, it will be good to raise their awareness!
Daniel

[ddasilva]

Thanks @jmbhughes !