Implement new suite of bootstrap current scalings

[chris-ashe]

This pull request includes several updates to the documentation and codebase, primarily focusing on the addition of new bootstrap current scaling methods and improvements to plotting functions.

Documentation Updates:

• Added descriptions and formulas for new bootstrap current scaling methods: ARIES, Andrade, Hoang, Wong, and Gi Scalings.
• Updated references to include citations for the new scaling methods.

Codebase Improvements:

• Modified plotting functions to use axis-specific methods instead of plt methods for better encapsulation.
• Added a new function plot_bootstrap_comparison to generate a comparison plot of bootstrap current fractions using various scaling methods.
• Updated the main_plot and main functions to include the new bootstrap comparison plot.
• Fixed a typo in the main_plot function comment.

Plasma Profiles:

• Added calculation for volume-averaged pressure assuming a parabolic profile in calculate_profile_factors.This pull request includes significant updates to the documentation and codebase, particularly focusing on the bootstrap current models and plotting functions. The most important changes include the addition of new bootstrap current scaling methods, updates to the plotting functions to use axis objects, and enhancements to the documentation.

Documentation Updates:

• Added new bootstrap current scaling methods (ARIES, Andrade, Hoang, Wong, Gi) and their descriptions in bootstrap_current.md.
• Included new references for the added bootstrap current scaling methods.

Codebase Enhancements:

• Updated the plot_proc.py to use axis objects instead of plt for plotting functions.
• Added a new plotting function plot_bootstrap_comparison to visualize bootstrap current fractions.

• Modified main_plot and main functions to include the new bootstrap comparison plot.

Physics Calculations:

• Integrated new bootstrap current scaling methods into the physics function.
• Added output variables for plasma pressure and pressure profile index in the outplas function.

Minor Fixes:

• Corrected variable name from plasma_current_MA to plasma_current_ma in plot_proc.py.
• Imported scipy in physics.py to support new calculations.

Checklist

I confirm that I have completed the following checks:

• 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

Attention: Patch coverage is 25.61983% with 90 lines in your changes missing coverage. Please review.

Project coverage is 27.13%. Comparing base (42780a9) to head (75ffc9c).

Files with missing lines	Patch %	Lines
process/io/plot_proc.py	1.92%	51 Missing ⚠️
process/physics.py	42.64%	39 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3355      +/-   ##
==========================================
+ Coverage   27.11%   27.13%   +0.01%     
==========================================
  Files          77       77              
  Lines       17816    17921     +105     
==========================================
+ Hits         4831     4862      +31     
- Misses      12985    13059      +74     

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[kj5248]

Had a look at the docs files and plot_proc, there are some changes throughout

[chris-ashe]

@kj5248 Changes pushed, please check again

[kj5248]

Single thing, otherwise I believe it is all good

[timothy-nunn]

Just one comment regarding profile assumptions. Feel free to merge if you dont think its a problem.