Add function to plot PF coil dimensions in summary plot

[chris-ashe]

This pull request introduces a new visualization for plotting the dimensions of PF (Poloidal Field) coils in the summary plotting workflow. The main change is the addition of the plot_pf_dimensions function, which visually annotates PF coil positions and dimensions on the plot, and its integration into the summary plotting routine.

New PF Coil Visualization

• Added plot_pf_dimensions function to summary.py, which plots the PF coil locations, dimensions, and annotations (ΔR and ΔZ) on a given axis, enhancing the clarity of PF coil geometry in the plots.

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 1.85185% with 53 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.15%. Comparing base (cd715d2) to head (3d10b02).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
process/core/io/plot/summary.py	1.85%	53 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4499      +/-   ##
==========================================
- Coverage   49.30%   49.15%   -0.16%     
==========================================
  Files         151      151              
  Lines       29611    29707      +96     
==========================================
+ Hits        14599    14601       +2     
- Misses      15012    15106      +94     

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