Set up MPI wrappers

[tkoskela]

It would be great if this could also set up the mpifort/mpif90/mpif77 wrappers for compiling MPI codes

[wpbonelli]

@tkoskela you might try https://github.com/mpi4py/setup-mpi. Note that setup-mpi currently must precede, not follow this action. Looking into a way to make them play nice together. Note also setup-mpi currently only supports 2021.10 on windows so I would suggest using the same. On linux intel 2022.1-2023.2 and intel-classic 2021.6-2021.10 have been reported to work.

Composing the two actions (ideally in either order) seems like the best solution, as this action is toolchain agnostic and none besides intel has a corresponding MPI, so MPI setup is kind of out of scope here.

Thanks @scharlton2 for investigating this