Intent to ship: Javascript Array grouping proposal

[Tom Schuster]

A proposal to make grouping of array items easier. Defines the functions Object.groupBy and Map.groupBy. Thanks to André Bargull for updating the implementation to the latest specification.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1792650

Standard: https://github.com/tc39/proposal-array-grouping (stage 3)

Platform coverage: all

Preference: javascript.options.array_grouping