Input params CSV unit and comment parsing [v3.13.13]

[softwareengineerprogrammer]

Description

Adds parse_units_and_comments optional flag to as_csv to parse units and comments as separate columns instead of raw entry

Testing & Verification

1. Unit tests added:
   1. test_csv_with_input_parameters_parse_units_and_comments
2. Unit tests updated:
   1. test_csv_with_input_parameters
3. Manual testing:
   1. Manually tested and reviewed
   2. Example CSV: https://gist.github.com/softwareengineerprogrammer/694424ec5a45a61c1c6a9ba0d2414115#file-fervo_project_cape-5_pr-167_2026-06-06-csv-L4905
   3. 🚧 Web interface CSV download

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Change Checklist

Observe the following checklist items before and after merging, as applicable.

Before merging:

1. I certify that I am a human and I have manually verified the correctness of the changes in this PR.
2. Add a CHANGELOG entry if your change includes a new version: https://github.com/softwareengineerprogrammer/GEOPHIRES/pull/167/changes#diff-2c623f3c6a917be56c59d43279244996836262cb1e12d9d0786c9c49eef6b43cR11 (TODO to update for main repo PR once created)

After merging:

1. 🚧 Push tag(s) to GitHub: git push origin refs/tags/v3.13.13: https://github.com/softwareengineerprogrammer/GEOPHIRES/releases/tag/v3.13.13
2. Post a change announcement to the GEOPHIRES Change Announcements Discussion N/A too minor

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Self-reviewed in #167