[chris-ashe]

Description

• Move all radiation calcs into a new class called PlasmaRadiation.
• Physics class now has composition with PlasmaRadiation
• Dedicated output method now for radiation and is pulled from outplas()

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 21.49533% with 84 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.34%. Comparing base (39e7dcd) to head (5426feb).

Files with missing lines	Patch %	Lines
process/models/physics/radiation_power.py	18.36%	80 Missing ⚠️
process/models/physics/physics.py	33.33%	2 Missing ⚠️
process/models/physics/impurity_radiation.py	66.66%	1 Missing ⚠️
process/models/stellarator/stellarator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4695      +/-   ##
==========================================
+ Coverage   50.26%   50.34%   +0.07%     
==========================================
  Files         181      181              
  Lines       30627    30655      +28     
==========================================
+ Hits        15395    15433      +38     
+ Misses      15232    15222      -10     

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