Heat transport vars dataclass

[clmould]

Description

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 69.54545% with 67 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.66%. Comparing base (b82bb46) to head (6fde92b).

Files with missing lines	Patch %	Lines
process/models/power.py	30.23%	30 Missing ⚠️
process/models/stellarator/stellarator.py	0.00%	16 Missing ⚠️
process/models/physics/current_drive.py	50.00%	6 Missing ⚠️
process/models/blankets/blanket_library.py	0.00%	4 Missing ⚠️
process/core/scan.py	0.00%	2 Missing ⚠️
process/models/blankets/dcll.py	0.00%	2 Missing ⚠️
process/models/blankets/hcpb.py	50.00%	2 Missing ⚠️
process/core/init.py	0.00%	1 Missing ⚠️
process/core/solver/objectives.py	0.00%	1 Missing ⚠️
process/models/ife.py	95.23%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4253      +/-   ##
==========================================
- Coverage   50.74%   50.66%   -0.08%     
==========================================
  Files         151      151              
  Lines       29662    29615      -47     
==========================================
- Hits        15051    15004      -47     
  Misses      14611    14611              

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