REFACTOR: Migrate post layout design toolkit

[eblanco-ansys]

Description

• Renamed extension to post_layout_design
• Refactored extension to new format
• Added unit and system tests

Issue linked

#6502

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).

[codecov]

Codecov Report

❌ Patch coverage is 90.86758% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.33%. Comparing base (0e281d2) to head (3ce451c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6638      +/-   ##
==========================================
- Coverage   82.33%   82.33%   -0.01%     
==========================================
  Files         242      241       -1     
  Lines       76847    76923      +76     
==========================================
+ Hits        63275    63335      +60     
- Misses      13572    13588      +16     

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