ci: add type check job and cleanup mypy refs

[SMoraisAnsys]

Description

First step into introducing type checking in PySpeos. At the moment, this modification is verbose but very light. It only checks src/ansys/speos/core/speos.py but whenever one wants to improve the type checking, removing and --ignore ... argument will allow to include the file back to the pool.

Issue linked

Associated to #481 (issue title has been updated since mypy isn't the tool anymore)

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 assigned this PR to myself.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: add optical property)
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.32%. Comparing base (0a86917) to head (b1bcd18).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #894      +/-   ##
==========================================
- Coverage   88.60%   88.32%   -0.29%     
==========================================
  Files          44       44              
  Lines        8757     8752       -5     
==========================================
- Hits         7759     7730      -29     
- Misses        998     1022      +24     

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