Bindings for quadrature data and element Jacobian

[th-skam]

This exposes sofa::fem::FinineElement's functions to allow integration of quantities using quadrature rules from the python scene side.

• quadrature_data returns the weights, shape functions and their gradients
• element_mapping returns the physical gradients and the mapping per element
• element_mapping_batch returns same as above for the whole mesh

[ci-depends-on https://github.com/sofa-framework/sofa/pull/6225]

Added an example, that shows how to integrate sources in python using the quadrature bindings on the existing topology.
White is the manufactured solution, green/red use quadrature degree = 2 and 1, respectively, to integrate the source term into nodal loads.
Result is trivial here but the option to choose the degree is important when computing errors in MMS.