REFACTOR: 6380 migrate import schematic extension

[eblanco-ansys]

Description

Migrated import schematic extension and added tests

Issue linked

#6380

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).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.36%. Comparing base (8d1a4ae) to head (999ca22).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6389   +/-   ##
=======================================
  Coverage   82.35%   82.36%           
=======================================
  Files         231      231           
  Lines       74340    74376   +36     
=======================================
+ Hits        61222    61259   +37     
+ Misses      13118    13117    -1     

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[eblanco-ansys]

Need to wait until #6417 merge for updating the tests