feat: add modeler.exit() method

[RobPasMue]

Description

We have the modeler.close() method but in order to be in line with the other PyAnsys libraries, we are also including modeler.exit() now. They will effectively perform the same calls.

Issue linked

Related to #1374

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 unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.87%. Comparing base (0c1f9b8) to head (634fbae).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1375   +/-   ##
=======================================
  Coverage   91.86%   91.87%           
=======================================
  Files          86       86           
  Lines        6788     6790    +2     
=======================================
+ Hits         6236     6238    +2     
  Misses        552      552           

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[AlejandroFernandezLuces]

LGTM, minor comment.