Add groupSortFn for a Column config #7133
Description
Now groupSortFn allowed to be defined on a feature level only. Should be possible to define custom grouper for column that wan't used in initial grouping and applied only after grouping by that column with UI.
I only see the groupSortFn but that applies the grouping immediately. I would like to specify a grouping function for a column so when I group by that column it would group using that function.