[MPL] add p_g dependent deVries vapor diffusion model

Jörg Buchwaldrequested to merge
joergbuchwald/ogs:vapor_diffusion_model into master

Gas pressure dependent vapor diffusion model as it is implemented in code bright. MR needs a consistent definition of phase_pressure over all processes (mainly TR/TRM/TH2M), i.e. must be merged first !4808 (merged)

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

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