Add Fortran Chapman column-model examples and CMake test wiring

[dwfncar]

• Adapted python Chapman TUV-x example to Fortran.

• Fortran program writes data to CSV files for further plotting.

• Results should be within numerical round-off of the Python results.

[github-actions]

📄 Documentation for this branch is available at: https://ncar.github.io/musica/branch/chapman_fortran/

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.22%. Comparing base (3d8f7a6) to head (248fbfc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #775      +/-   ##
==========================================
- Coverage   70.17%   67.22%   -2.95%     
==========================================
  Files         116      101      -15     
  Lines        8908     7872    -1036     
==========================================
- Hits         6251     5292     -959     
+ Misses       2657     2580      -77     

Flag	Coverage Δ
cpp_fortran	65.87% <ø> (ø)
javascript	?
python	69.32% <ø> (ø)

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