Fixes #249, adds dependencies for PyPI packaging and updates CI tests

[pluflou]

• updated pyproject.toml
  • added deps based on environment.yml
  • dask and mpi4py added to dev deps based on conda-forge recipe
• updated environment.yml
  • matplotlib moved from deps to "regular" deps based on feedback from Ryan
  • adjusted mkdocs-jupyter install since #31 is resolved
• updated conda-setup/action.yml to support pip install if/when environment.yml is not available
  • when environment.yml is not available, the conda runner will install python=3.12 by default, checking for this regardless of the cache existing avoids errors wrt the python version
  • added binaries needed for MPI when a pip install is done