Extract some basic TH2M constitutive relations
Extraction of constitutive relations (CRs) same as in TRM. This is first batch of CRs, phase change is next. Then also adding Jacobian terms and reusing them in the assembly. Some of the CRs will be merged with TRM in upcoming MR.
Review commit-wise. Each commit compiles and all tests run successfully.
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Feature description was added to the changelog -
Tests covering your feature were added? Existing tests -
Any new feature or behaviour change was documented?