Add helper function for creating midsurface (a.k.a VLM) meshes

[A-CGray]

Purpose

Adds a helper function that uses a very similar approach to the fitted FFD generation code to generate a midsurface mesh of a wing, that can then be used in a VLM code. The generated meshes follow the camber line of each section of the wing, for example:

I added a test that uses a new input file that I added to the pygeo input files tarball

Expected time until merged

No rush

Type of change

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [ ] Maintenance update
• [ ] Other (please describe)

Testing

Checklist

• [ ] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [ ] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [ ] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

:x: Patch coverage is 93.87755% with 3 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 67.10%. Comparing base (cecefd2) to head (d91124a). :warning: Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pygeo/geo_utils/mesh_generation.py	93.47%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
+ Coverage   67.00%   67.10%   +0.10%     
==========================================
  Files          47       48       +1     
  Lines       12331    12378      +47     
==========================================
+ Hits         8262     8306      +44     
- Misses       4069     4072       +3     

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[A-CGray]

Not sure what's happening with the docs build, I can't recreate it locally

[A-CGray]

Docs build failure should be fixed by https://github.com/mdolab/sphinx_mdolab_theme/pull/17

[A-CGray]

@ArshSaja can you please review this?