add pulser scan analysis module

[fraborra]

Provides pulser scan analysis methods.
Exposed as both standalone functions and via a wrapper class to improve usability and flexibility.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 175 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.15%. Comparing base (c842646) to head (2d38242).

Files with missing lines	Patch %	Lines
src/pygama/pargen/pul_scan_ana.py	0.00%	175 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
- Coverage   51.22%   50.15%   -1.07%     
==========================================
  Files          60       61       +1     
  Lines        8219     8394     +175     
==========================================
  Hits         4210     4210              
- Misses       4009     4184     +175     

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