THM freezing; extract relative permeability function

Make the relative permeability change due to ice formation function available through the MPL.

Closes https://gitlab.opengeosys.org/owf/second-project-phase/th3-freezing/-/issues/3

  1. Feature description was added to the changelog
  2. Tests covering your feature were added? Existing tests.
  3. Any new feature or behaviour change was documented?
Edited by Dmitri Naumov

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