Costs 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 94.35484% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.73%. Comparing base (b9e97d7) to head (5ae17bf).

Files with missing lines	Patch %	Lines
process/models/availability.py	87.77%	11 Missing ⚠️
process/core/solver/constraints.py	50.00%	6 Missing ⚠️
process/core/scan.py	0.00%	4 Missing ⚠️
process/models/costs/costs_2015.py	63.63%	4 Missing ⚠️
process/core/solver/objectives.py	40.00%	3 Missing ⚠️
process/core/solver/evaluators.py	0.00%	2 Missing ⚠️
process/models/ife.py	33.33%	2 Missing ⚠️
process/core/caller.py	0.00%	1 Missing ⚠️
process/core/final.py	0.00%	1 Missing ⚠️
process/main.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4196      +/-   ##
==========================================
- Coverage   52.10%   51.73%   -0.38%     
==========================================
  Files         148      148              
  Lines       30389    30143     -246     
==========================================
- Hits        15835    15593     -242     
+ Misses      14554    14550       -4     

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[je-cook]

Have you checked that these changes work for custom cost models?