feat(trainer): log model explanation with shap (#886)

* build: add `shap`

* feat(l2g): log feature contributions with shap

* chore: update lock file

* fix: ignore installed packages in `install_dependencies_on_cluster.sh` (problem with llvm)

* build: add `matplotlib`

* fix: pin `matplotlib` version to avoid mplDeprecation issue

* fix(trainer): set default features_list + minor bugs

* chore: pre-commit auto fixes [...]