Support for MPI

[cgisky1980]

ggml-org/ggml#340

ggml-org/llama.cpp#2099

The project hasn't been updated for a month, so I'll find some work for someone to do

[theycallmeloki]

@cgisky1980
I would like to pick this up continuing parallelly from ggerganov/llama.cpp#2164

I believe rwkv might be more optimized for the use case I am on currently so if you can boil it a bit to generic steps I would need to take to complete it, I'll try to pick it up