feat: add `stats/incr/nanmcovariance`#6865

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SergeantQuickscoper wants to merge 2 commits intostdlib-js:developfrom

SergeantQuickscoper:feature/nanmcovariance

Commits on Apr 29, 2025

feat(stats/incr/nanmcovariance): add nanmcovariance to the stats/incr/* namespace
SergeantQuickscoper
committed

Commits on Apr 30, 2025

fixup! feat(stat/incr/nanmcovariance): add extra nanmcovariance test cases
SergeantQuickscoper
committed