Fusion contour plots plot proc

[chris-ashe]

Description

Contour plots for the 4 main fusion reactions have been added

A cumulative fusion reaction line (in lblack) has been added to the previous 1D plot

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 1.09290% with 181 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.19%. Comparing base (0028693) to head (b4e58ea).

Files with missing lines	Patch %	Lines
process/io/plot_proc.py	1.09%	181 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3939      +/-   ##
==========================================
- Coverage   46.42%   46.19%   -0.24%     
==========================================
  Files         123      123              
  Lines       28212    28357     +145     
==========================================
+ Hits        13098    13100       +2     
- Misses      15114    15257     +143     

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[j-a-foster]

Happy with plot proc changes.