354 add phase to beamcut mds and also a function to plot it

[vsmagalhaes]

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Codecov Report

❌ Patch coverage is 98.11321% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.51%. Comparing base (45e1b7e) to head (1b4219c).
⚠️ Report is 10 commits behind head on astrohack-dev.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/astrohack/io/beamcut_mds.py	98.00%	1 Missing ⚠️
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Additional details and impacted files

@@                Coverage Diff                @@
##           astrohack-dev     #355      +/-   ##
=================================================
+ Coverage          70.35%   70.51%   +0.15%     
=================================================
  Files                 56       56              
  Lines               8552     8601      +49     
=================================================
+ Hits                6017     6065      +48     
- Misses              2535     2536       +1     

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