use it in existing open-atmos projects and beyond

[slayoo]

• [ ] numba-mpi
• [x] PySDM: https://github.com/open-atmos/PySDM/pull/1070
• [x] PyMPDATA: https://github.com/open-atmos/PyMPDATA/pull/399
• [x] PyMPDATA-MPI: https://github.com/open-atmos/PyMPDATA-MPI/pull/72
• [x] PyPartMC: https://github.com/open-atmos/PyPartMC/pull/221

[github-actions[bot]]

Stale issue message

[slayoo]

well, numba-mpi is not hosted within open-atmos, so for now let's treat it as complete