FEAT: flux lines plot

[anur7]

Description

This PR allows to correctly plot flux lines in Maxwell.

Issue linked

Issue #6573

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.25%. Comparing base (a867ee5) to head (39eff4f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6575      +/-   ##
==========================================
- Coverage   83.26%   83.25%   -0.01%     
==========================================
  Files         246      246              
  Lines       77487    77489       +2     
==========================================
- Hits        64520    64514       -6     
- Misses      12967    12975       +8     

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[Samuelopez-ansys]

LGTM

[Samuelopez-ansys]

@anur7 You missed adding a unit test

[Samuelopez-ansys]

I will change it to draft until it is not ready, Please test it locally first