Add enriching dpf capabilities tutorials to the main tutorials branch

[luisaFelixSalles]

Add new tutorials to the enriching dpf capabilities Custom Operators and Plugins section:

• It adapts some "how-tos" into this section
• It changes some examples names

Tutorials added:

• Create custom operators and plugins
• Create a plug-in package with multiple operators
• Create a plug-in package that has third-party dependencies

Preview on how it renders:

Custom Operators and Plugins section main page

Create custom operators and plugins tutorial

Create a plug-in package with multiple operators

Create a plug-in package that has third-party dependencies

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.10%. Comparing base (df79026) to head (bf20f55).

Additional details and impacted files

@@                      Coverage Diff                      @@
##           doc/new-tutorials-section    #1890      +/-   ##
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- Coverage                      88.16%   88.10%   -0.07%     
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  Files                             83       83              
  Lines                           9961     9951      -10     
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- Hits                            8782     8767      -15     
- Misses                          1179     1184       +5     

[PProfizi]

Hey @luisaFelixSalles could we maybe do something more explicit than "enriching DPF capabilities"? I feel that we should have a section dedicated to "Custom Operators and Plugins".

[PProfizi]

Also, to me this example 02-python_operators_with_dependencies.py should become a tutorial, no?

[PProfizi]

The tutorials section for Creating Custom DPF Operators and Plugins with Python should have a few tutorials:

• Create a custom DPF plugin in Python
• Create a custom DPF plugin in Python with third-party dependencies
• Load and use a custom DPF plugin in PyDPF
• Load and use a custom DPF plugin in Mechanical

[luisaFelixSalles]

Hey @luisaFelixSalles could we maybe do something more explicit than "enriching DPF capabilities"? I feel that we should have a section dedicated to "Custom Operators and Plugins".

yes i can change this name, not a problem

[luisaFelixSalles]

The tutorials section for Creating Custom DPF Operators and Plugins with Python should have a few tutorials:

• Create a custom DPF plugin in Python
• Create a custom DPF plugin in Python with third-party dependencies
• Load and use a custom DPF plugin in PyDPF
• Load and use a custom DPF plugin in Mechanical

Yes, i'll put in the PR description the tutorials that this section has. Because I actually put the "load" explanations into each tutorial