Do not initialize the pinned mdarray at construction time #5194

Job	Run time
changed-files / Check changed files	7s
checks / other-checks	32s
devcontainer / build (amd64, 12.5, conda)	4m 18s
checks / check-style	2m 8s
devcontainer / build (amd64, 12.5, pip)	4m 47s
wheel-build-pylibraft	0s
conda-cpp-build	0s
wheel-tests-pylibraft	0s
conda-cpp-checks	0s
conda-cpp-tests	0s
conda-python-build	0s
conda-python-tests	0s
wheel-build-raft-dask	0s
docs-build	0s
wheel-tests-raft-dask	0s
pr-builder / run	1s
	11m 53s

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