Enforce use of slots on all data structures

[timothy-nunn]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.23404% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.13%. Comparing base (11881e8) to head (1f3e2e7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/stellarator/preset_config.py	0.00%	3 Missing ⚠️
process/models/stellarator/heating.py	0.00%	2 Missing ⚠️
process/models/stellarator/stellarator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4267   +/-   ##
=======================================
  Coverage   50.13%   50.13%           
=======================================
  Files         151      151           
  Lines       29343    29349    +6     
=======================================
+ Hits        14710    14714    +4     
- Misses      14633    14635    +2     

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