New API: export_FEA_model()

[ansnfernand]

Checklist:

• Run unit tests and make sure they all pass
• Check and fix style errors
  - pre-commit command line check
  - Problems tab in PyCharm
• Bench test new/modified APIs by using and modifying the code in the example for the API method
• Add new classes to rst files, located at: \doc\source\api
• Generate documentation
• Verify the HTML. It gets generated at: \doc\build\html.
  - Open index.html
  - Click on "API Reference" at the top.
  - Verify HTML for API changes.
• Check that test code coverage is at least 80% when Sherlock is running and can be connected to using gRPC

[codecov]

Codecov Report

Attention: Patch coverage is 51.89873% with 38 lines in your changes missing coverage. Please review.

Project coverage is 57.63%. Comparing base (1ca31ac) to head (510587f).

Files	Patch %	Lines
src/ansys/sherlock/core/model.py	44.11%	38 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #334      +/-   ##
==========================================
- Coverage   57.75%   57.63%   -0.12%     
==========================================
  Files          21       21              
  Lines        4244     4322      +78     
==========================================
+ Hits         2451     2491      +40     
- Misses       1793     1831      +38     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.