feat: Add FIM coupling for single phase fracture ALM #3961
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This PR tries to draft the fully implicit coupling approach for single phase with ALM fracture feature.
Some tests have been performed with this implementation on the inclined fault case with analytical solutions and compared to the sequential iterative method:
Effective stress:

A small deviation appears in the displacement X:

For hexahedral grid:

For tetrahedral grid:

Further checks and tests are necessary to see the consistency of the method.