Create confinement time dataclass

[chris-ashe]

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 50.00000% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.81%. Comparing base (bcd37bc) to head (cc466ee).

Files with missing lines	Patch %	Lines
process/models/physics/physics.py	0.00%	7 Missing ⚠️
process/models/stellarator/stellarator.py	0.00%	7 Missing ⚠️
process/models/physics/confinement_time.py	88.88%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4398   +/-   ##
=======================================
  Coverage   48.80%   48.81%           
=======================================
  Files         151      151           
  Lines       29348    29375   +27     
=======================================
+ Hits        14323    14338   +15     
- Misses      15025    15037   +12     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.