document & refactor artifacts.get_artifacts()

[jGaboardi]

This PR:

• refactor artifacts.get_artifacts()
• • adds docstring
• • adds type hints
• • adds small tests where no threshold found
• testing, refactor, & docstrings #20

[martinfleis]

Ah, too early to approve. Some failures caught by CI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.7%. Comparing base (b2a1e53) to head (7bd0f0d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #103     +/-   ##
=======================================
+ Coverage   98.6%   98.7%   +0.1%     
=======================================
  Files          6       6             
  Lines        921     936     +15     
=======================================
+ Hits         908     924     +16     
+ Misses        13      12      -1     

Files with missing lines	Coverage Δ
sgeop/artifacts.py	97.3% <100.0%> (+0.4%)	⬆️

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