Perf/numba speedup

[pietrodantuono]

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[codecov]

Codecov Report

❌ Patch coverage is 86.11111% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.76%. Comparing base (08193f9) to head (6cefa84).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
py_fatigue/utils.py	80.27%	29 Missing ⚠️
py_fatigue/material/sn_curve.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #26      +/-   ##
===========================================
+ Coverage    89.88%   90.76%   +0.87%     
===========================================
  Files           24       24              
  Lines         2165     2338     +173     
===========================================
+ Hits          1946     2122     +176     
+ Misses         219      216       -3     

Flag	Coverage Δ
unittests	90.76% <86.11%> (+0.87%)	⬆️

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