Add `nom_addProjectedAreaConstraint` and allow non-scaled area/volume constraints

[A-CGray]

Purpose

As-per the title

Expected time until merged

1-2 weeks

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

• [x] 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
• [x] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #196 (0e34746) into main (7ca8f36) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
- Coverage   64.87%   64.86%   -0.02%     
==========================================
  Files          47       47              
  Lines       11941    11944       +3     
==========================================
  Hits         7747     7747              
- Misses       4194     4197       +3     

Impacted Files	Coverage Δ
pygeo/mphys/mphys_dvgeo.py	0.00% <0.00%> (ø)

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