REFACTOR: Pathlib hfss.py

[jvela018]

Issue linked

#5180

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[MaxJPRey]

LGTM.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.13%. Comparing base (979f6c2) to head (dc348de).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6054      +/-   ##
==========================================
- Coverage   85.13%   85.13%   -0.01%     
==========================================
  Files         167      167              
  Lines       63042    63041       -1     
==========================================
- Hits        53672    53671       -1     
  Misses       9370     9370              

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[jvela018]

@MaxJPRey Do you mind approving again. I had to make some additional minor changes to not cast to str when not interacting with the native API. Everything looks pretty much the same except a minor change I made on design.py