[GeoMechanicsApplication] Merging well constitutive law from the CoSim branch

[mnabideltares]

@mnabideltares will add details to this issue.

The filter (well) element for Pw is still not merged into the master. It is already in the CoSim branch.
The purpose her, is to take this functionality from the cosim branch and merge to master. This has to be done mannualy.

NB: The thermal filter element is already merged to the master. This isuue is only about Pw filter element.

master...geo/11959-improved-thermal-cosim

To do:

1. Isolating the work in a separate branch
2. Add a check that the orientation of the element is not horizontal
3. Making unit tests and integration test
4. Documentation