Broadcasting arrays with MPI requires types to be known.

[sidward]

As of 85739eee0a2db4c14074b670e63e36de0cc5a8f2, MPI.COMPLEX is passed into Bcast. However, this is assuming the input array is complex. Ideally, there should be a dictionary that describes the relationship between data-types in numpy/cupy and the MPI types. I did try something akin to this but I got a dictionary error when trying to index complex types.