feat: graphics submodule

[clatapie]

Description

This PR follows the PyConverter-XML2Py integration plan to automate the PyMAPDL_commands documentation.
The changes have been generated using pyconverter-xml2py and more specifically mapdl-cmd-conv.

This PR focus on the graphics submodule.

Pinging @ansys/pymapdl-developers for visibility. Feel free to provide any feedback on the way the docstrings and the source code generation are handled.

Issue linked

This PR is meant to be merged within the feat/main_commands branch. The latter will gather all the submodule changes, one by one, prior to be merged to the main branch.

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• 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 marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

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[github-actions]

The towncrier template has been successfully rewritten with the default template.
Please ensure that sphinx-design is included as a dependency in your project's documentation requirements.
Additionally, add sphinx-design to the extensions list in your conf.py file.
For more information, please refer to the migration guide at:
https://actions.docs.ansys.com/version/stable/migrations/index.html#migration-guide

Migration guide — Ansys Actions

[RobPasMue]

@clatapie - what's missing here? Can we have it merged?

[clatapie]

This PR is also ready to merged if no additional changes are required.
Pinging @germa89 and @RobPasMue for visibility.

[RobPasMue]

Fine by me -- letting it to @germa89 for the final call

[germa89]

Few changes. One of the most important is the empty :math: commands.

[MaxJPRey]

Thanks for the thorough review @germa89.
Great work @clatapie, I think this PR is close to a final state. Maybe some comments could be transformed in issue as soon as you merge your last commits and updates @germa89 's comments.

[clatapie]

Pinging @germa89, @RobPasMue and @MaxJPRey for final review.
IMO, this PR is ready to be merged.

[germa89]

Looks good to me.

@clatapie @RobPasMue Shall we fix the Math equations (:math:) before merging more modules? Or do you prefer to go ahead with more modules?

[RobPasMue]

Looks good to me.

@clatapie @RobPasMue Shall we fix the Math equations (:math:) before merging more modules? Or do you prefer to go ahead with more modules?

I would move forward

[clatapie]

I agree with @RobPasMue, math equations will be added in a future pyconverter-xml2py enhancement.