Surface output for forces in lift and drag directions

[sseraj]

Purpose

This PR adds force coefficients per unit area projected in the lift and drag directions as surface output variables. Here is an example of the force in the drag direction for the MACH tutorial wing case:

It would be great if the reviewers could test this on their own cases.

Expected time until merged

2-3 weeks

Type of change

• Bugfix (non-breaking change which fixes an issue)
• 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

No tests, but I tried this on wing and full aircraft cases and the outputs made sense.

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.13%. Comparing base (6706920) to head (558a5ca).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #358   +/-   ##
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  Coverage   41.13%   41.13%           
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  Files          13       13           
  Lines        4108     4108           
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  Hits         1690     1690           
  Misses       2418     2418           

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