feat: add mypy in pre-commit

[dipinknair]

added mypy pre-commit and fixed all issues with type hints

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.76% (target: -1.00%)	✅ 83.33%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bc2e960)	3109	2545	81.86%
Head commit (bf09c39)	3122 (+13)	2532 (-13)	81.10% (-0.76%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1502)	60	50	83.33%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.10%. Comparing base (bc2e960) to head (bf09c39).

❌ Your patch check has failed because the patch coverage (83.33%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1502      +/-   ##
==========================================
- Coverage   81.18%   81.10%   -0.09%     
==========================================
  Files          42       42              
  Lines        3109     3122      +13     
==========================================
+ Hits         2524     2532       +8     
- Misses        585      590       +5     

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[github-actions]

The documentation for this pull request will be available at https://mechanical.docs.pyansys.com/pull/1502. Please allow some time for the documentation to be deployed.