feat: add `stats/base/ndarray/sdsnanmean` #17596

Job	Run time
Rebase this PR on top of develop branch	0s
Merge changes from develop branch into this PR	-1s
Remove in-progress label	-1s
Auto-fix lint errors	-7s
Check for required files	-8s
Update copyright header years	-9s
Manage labels	-10s
	-36s

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