FEAT: Add layout boundaries

[Samuelopez-ansys]

With this implementation, you can get the boundaries in a HFSS 3DLayout design, and then with the object_properties, you can manipulate these boundaries.

For instance:

aedtapp.boundaries[0].object_properties.props["Boundary Type"] = "PEC"

It was not possible before.

Close #3251

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 52.94118% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 75.79%. Comparing base (6785a3b) to head (4cc1e16).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4684   +/-   ##
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  Coverage   75.78%   75.79%           
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  Files         121      121           
  Lines       54810    54826   +16     
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+ Hits        41540    41553   +13     
- Misses      13270    13273    +3