feat: add stochastic fem example

[moe-ad]

Description

This PR will add an example to the PyMAPDL documentation

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 reviewed my changes before submitting this pull request.
• 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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.09%. Comparing base (e6221a6) to head (9eb7d9b).
Report is 4 commits behind head on main.

Additional details and impacted files

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- Coverage   87.14%   87.09%   -0.05%     
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  Files         187      187              
  Lines       14697    14697              
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- Hits        12808    12801       -7     
- Misses       1889     1896       +7     

[moe-ad]

@germa89 can you please provide feedback on the work done so far?
Thank you.

[germa89]

@moe-ad great example! Really. It is very detailed, well documented and well written. The PyMAPDL code is great. I like that you do not recreate the model, rather change the materials. Also I like you used the MapdlPool object. I wonder if you had much issues with it.

Given the topic (stochastic FEM) I was considering to move it to Academic examples section but that section is interactive. So let's keep it here for the moment.

[germa89]

Also your CICD failed because precommit bot did the last commit, so you might want to do an empty commit to retrigger. Also check vale issues.

[moe-ad]

Thank you very much @germa89 for the detailed review.

[moe-ad]

Given the topic (stochastic FEM) I was considering to move it to Academic examples section but that section is interactive. So let's keep it here for the moment.

That is the appropriate section for it truly but I couldn't think of a way we could include this example there since sphinx gallery handles that section.

[PipKat]

@moe-ad This is one of the most complex examples I've seen, and I am very impressed. I've no knowledge of the subject matter, so feel free to ignore suggestions that are inappropriate. Great job!

[moe-ad]

@PipKat thank you for the detailed reviewed. I have incorporated all of your suggestions.

[germa89]

There were no major suggestions the time before, and @PipKat already reviewed it. I am assuming no big changes since last I reviewed. So I am happy to approve.

Good job @moe-ad !! Very nice and detailed example!