[MPL] Enable arbitrarily rotated anisotropic thermal expansivities by allowing the conversion from 3x3 matrices to KelvinVectors

Merged joergbuchwald requested to merge joergbuchwald/ogs:aniso_expansivity into master

If thermal expansivities are read-in as parameter-type properties, they can be implicitly rotated into the global coordinate system. This MR allows for the correct conversion from a 3x3 matrix into a Kelvin vector.

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Edited by joergbuchwald

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