Fix setup.py to include engine data files to the package

[kanekosh]

Purpose

I realized that the engine data files (.npy) were not included in the package, so when we install openconcept from PyPI and try to run examples that requires engine data file (e.g. B738_sizing.py), it fails saying that engine .npy files are not found. I guess we've overlooked this because it works fine when owe git clones the repo and install with -e, which is also what GHA build does. (or Python packaging might have changed recently? Not exactly sure).

This PR fixes setup.py to include the engine data files to the package so pip-installing from PyPI installs these files.

To test it out, I added a block to the GHA build to install openconcept in a clean environment and checks if there exists engine .npy files in the installed package. It looks like it's working, but we can't directly verify the PyPI installation until we merge this PR and deploy a new version to PyPI.

I'm also ok with removing the new block in GHA as it doesn't look very neat.

Expected time until merged.

Soon

Type of change

What types of change is it?
Select the appropriate type(s) that describe this PR

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

Testing

See above

Checklist

Put an x in the boxes that apply.

• 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 82.05%. Comparing base (e304402) to head (38b29e7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #84   +/-   ##
=======================================
  Coverage   82.05%   82.05%           
=======================================
  Files         103      103           
  Lines       10729    10729           
=======================================
  Hits         8804     8804           
  Misses       1925     1925           

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