create a NCCL sub-communicator using ncclCommSplit #5237

Job	Run time
changed-files / Check changed files	10s
checks / other-checks	39s
checks / check-style	2m 6s
devcontainer / amd64, 12.5, conda	3m 50s
devcontainer / amd64, 12.5, pip	3m 47s
conda-cpp-build	0s
wheel-build-pylibraft	0s
conda-cpp-checks	0s
conda-cpp-tests	0s
conda-python-build	0s
wheel-tests-pylibraft	0s
docs-build	0s
conda-python-tests	0s
wheel-build-raft-dask	0s
wheel-tests-raft-dask	0s
pr-builder / run	1s
	10m 33s

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