Way to store only energy spectra for compass measurements

[RemDelaporteMathurin]

Needs #78

[codecov]

Codecov Report

❌ Patch coverage is 95.23810% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.46%. Comparing base (12149de) to head (67a8f04).
⚠️ Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
...lbox/neutron_detection/activation_foils/compass.py	95.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   86.41%   86.46%   +0.05%     
==========================================
  Files          18       18              
  Lines        1457     1478      +21     
==========================================
+ Hits         1259     1278      +19     
- Misses        198      200       +2     

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