[PL/THM+TR+TRM] Set coordinates in SpatialPosition
This MR sets coordinates in SpatialPosition such that the parameter type Function can be used for MPL property and mechanical constituitive relation parameters.
Fixes the issue raised in https://discourse.opengeosys.org/t/heterogeneous-material-such-as-position-dependent-youngs-modulus/755 This MR partially fixes #3221 (closed) (someone needs to apply it to the remaining processes as well).
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