Integrate PHS into STEMMUS-SCOPE

closes #266

[ ] Add a reference to related issues.
[ ] @mentions of the person or team responsible for reviewing proposed changes.
[ ] This pull request has a descriptive title.
[ ] Code is written according to the guidelines.
[ ] The checks by MISS_HIT style checker and linter, below the pull request, are successful (green).
[ ] Documentation is available.
[ ] Add changes to the changelog file under section Unreleased.
[ ] Model runs successfully, see tests.
[ ] Ask a meinatainer to re-generate exe file if matlab codes are changed. About how to create an exe file, see exe readme.

EcoExtreML / STEMMUS_SCOPE