Feature: Add basic NCCL communication space backend #128
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CMake module for finding NCCL was taken from pytorch repo. Need to look into licensing rules.
This change allows users to avoid having to use backend-specific reduction types when calling KokkosComm functions.
NCCL can now be enabled without explicitly requiring enabling MPI. However, need to check that MPI is still an available dependency as it is the fallback communication backend!
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This is still very much WIP and cannot build at the moment. I am simply opening the PR so that folks meeting at SC24 can exchange on it. 👍