Implement Model ABC on all models

[clmould]

Description

First step for the new dataclass structure is the update all PROCESS models so they implement the Model abstract base class.

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 49.37500% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.86%. Comparing base (87727f9) to head (0b7dd5d).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
process/core/output.py	0.00%	23 Missing ⚠️
process/core/caller.py	0.00%	17 Missing ⚠️
process/models/power.py	23.52%	13 Missing ⚠️
process/models/physics/physics.py	50.00%	6 Missing ⚠️
process/models/fw.py	50.00%	3 Missing ⚠️
process/models/tfcoil/base.py	71.42%	2 Missing ⚠️
process/models/tfcoil/superconducting.py	50.00%	2 Missing ⚠️
process/models/availability.py	75.00%	1 Missing ⚠️
process/models/blankets/dcll.py	66.66%	1 Missing ⚠️
process/models/blankets/hcpb.py	66.66%	1 Missing ⚠️
... and 12 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4146      +/-   ##
==========================================
+ Coverage   47.66%   47.86%   +0.19%     
==========================================
  Files         143      143              
  Lines       29988    30051      +63     
==========================================
+ Hits        14294    14384      +90     
+ Misses      15694    15667      -27     

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[timothy-nunn]

Just some cases where you are doing

def output(self):
  self.other_output_method()

where I think we should just rename other_output_method to output so that we don't have an output method defined just to call one other method.