Significant refactor of the optika.signals subpackage which allows for caching material fits.

[roytsmart]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.09%. Comparing base (ad0e643) to head (84a0be5).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   99.10%   99.09%   -0.01%     
==========================================
  Files          95       91       -4     
  Lines        5038     4993      -45     
==========================================
- Hits         4993     4948      -45     
  Misses         45       45              

Flag	Coverage Δ
unittests	99.09% <100.00%> (-0.01%)	⬇️

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