feat: add plot/vega/base/assert/is-area-mark-orientation#12001

kgryte merged 2 commits intostdlib-js:refactor/plotstdlib-js/stdlib:refactor/plotfrom

Sachinn-64:base-assert-is-area-mark-orientationSachinn-64/stdlib:base-assert-is-area-mark-orientationCopy head branch name to clipboard