REFACTOR: Move internal files to a new directory

[Samuelopez-ansys]

Description

Generic directory has grown the last few years, and this PR is moving the files that are used internally in PyAEDT, and should not be used by the user.

Issue linked

Issue #5504

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[ansys-reviewer-bot]

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[MaxJPRey]

Great initiative @Samuelopez-ansys ! Indeed the scope of this generic folder increased over time.

[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.94%. Comparing base (463b124) to head (801b240).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5910      +/-   ##
==========================================
- Coverage   84.94%   84.94%   -0.01%     
==========================================
  Files         162      162              
  Lines       62305    62307       +2     
==========================================
  Hits        52926    52926              
- Misses       9379     9381       +2     

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[svandenb-dev]

LGTM