feat: add stats/base/ndarray/variancewd#9634

DivyanshuVortex wants to merge 5 commits intostdlib-js:developstdlib-js/stdlib:developfrom

DivyanshuVortex:stats/base/ndarray/variancewdDivyanshuVortex/stdlib:stats/base/ndarray/variancewdCopy head branch name to clipboard