Add Analysis unit for Septop

[IAlibay]

Fixes #1917

Checklist

• All new code is appropriately documented (user-facing code must have complete docstrings).
• Added a news entry, or the changes are not user-facing.
• Ran pre-commit: you can run pre-commit locally or comment on this PR with pre-commit.ci autofix.

Manual Tests: these are slow so don't need to be run every commit, only before merging and when relevant changes are made (generally at reviewer-discretion).

• GPU integration tests [run locally]
• example notebook testing
• packaging tests: run this for any large feature PRs or PRs that add test data.

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[IAlibay]

pre-commit.ci autofix

[IAlibay]

pre-commit.ci autofix

[IAlibay]

pre-commit.ci autofix

[codecov]

Codecov Report

❌ Patch coverage is 89.21348% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.45%. Comparing base (7959cc6) to head (56320a8).

Files with missing lines	Patch %	Lines
src/openfe/protocols/openmm_septop/base_units.py	76.57%	26 Missing ⚠️
...ts/protocols/openmm_septop/test_septop_protocol.py	77.77%	12 Missing ⚠️
.../tests/protocols/openmm_septop/test_septop_slow.py	0.00%	3 Missing ⚠️
src/openfecli/commands/gather_septop.py	66.66%	3 Missing ⚠️
src/openfe/protocols/openmm_septop/septop_units.py	92.00%	2 Missing ⚠️
...cols/openmm_septop/test_septop_protocol_results.py	98.85%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1937      +/-   ##
==========================================
- Coverage   94.78%   90.45%   -4.34%     
==========================================
  Files         210      214       +4     
  Lines       18841    18968     +127     
==========================================
- Hits        17859    17158     -701     
- Misses        982     1810     +828     

Flag	Coverage Δ
fast-tests	90.45% <89.21%> (?)
slow-tests	?

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[hannahbaumann]

Thanks @IAlibay , this looks great, just left some small comments.

[IAlibay]

pre-commit.ci autofix

[github-actions]

No API break detected ✅

[hannahbaumann]

Thanks @IAlibay , lgtm! Is the failing codecov something we should be concerned about or is this related to slow tests?