feat: Add Young Modulus & Poisson import from VTK mesh

[npillardou]

This feature adds register data fields for Poisson's ratio and Young Modulus directly from VTK mesh, avoiding any external conversion operations.

It also offers the possibility to obtain them as output by adding (according to user needs) :

<Outputs> <VTK name="vtkOutput" fieldNames="{ rock_youngModulus, rock_poissonRatio }" /> </Outputs>

[jhuang2601]

For most common materials, Poisson’s ratio falls within the range of 0 to 0.5.

[npillardou]

I agree with you, but there was some checks already done around line 80-84 that were with this range :

  if( nu > -0.5 && nu < 0.5 )
  {
    ++numConstantsSpecified;
    errorCheck += "nu, ";
  }

So I kept them as it is.

[dkachuma]

My understanding of (nu, E, K and G) is that we need only 2 of these. What combinations are currently supported. Currently you can provide K and G. You're proposing nu and E I suppose, but can we do any other combinations. Maybe just add a note in the documentation. For example what happens if the user tries to load K and E?