Add mesh tutorials to the main tutorials branch

[luisaFelixSalles]

Add new plot tutorials to the mesh section:

List of tutorials:

• Create a mesh from scratch
• Get a mesh from a result file
• Read and get specific information from a mesh
• Get a mesh split on different parts
• Split a mesh

Preview on how it renders:

Mesh section main page

Create a mesh from scratch

Get a mesh from a result file

Read and get specific information from a mesh

Get a mesh split on different parts

Split a mesh

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.02%. Comparing base (df79026) to head (3e7efd2).

Additional details and impacted files

@@                      Coverage Diff                      @@
##           doc/new-tutorials-section    #1908      +/-   ##
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- Coverage                      88.16%   88.02%   -0.14%     
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  Files                             83       83              
  Lines                           9961     9963       +2     
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- Hits                            8782     8770      -12     
- Misses                          1179     1193      +14     

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[PProfizi]

Could we restrict the mesh from scratch tutorial to just that? I think the add data and plot data sections should appear somewhere else. Also, this is not "adding" data to the mesh but rather creating data from scratch which we then plot on the mesh. I think this is covered in the plotting tutorials, and the data part should probably be in a tutorial on creating Fields and FieldsContainers from scratch which we can add separately.

[PProfizi]

Get a mesh from a result file: problem with rendering for the mesh_provider operator reference in the section title.
Also we should add a section regarding the meshes_provider.

[PProfizi]

Read and get specific information from a mesh:
rename to read mesh metadata.
I see several references not rendering properly.
Also this looks like two examples where put one after the other, could we rather merge them into one, while giving indications on specifics for different solvers?

[PProfizi]

Get a mesh split on different parts: I think we reshape the tutorial to something very small explaining how to get a mesh split by body for each solver (Fluent+CFX or LSDYNA) with the mesh_provider/meshes_provider (explain the region_scoping input pin)

Basically here the idea would be to show how to Extract a mesh as split per body

The next tutorial on Split a mesh can then be focused on splitting on already existing MeshedRegion into a MeshesContainer, based on mesh properties. There is the split_mesh operator, but there is also the two-steps way using scoping.split_on_property_type and then mesh.from_scoping(s)