feat: add isDesc to sortingFn

[tychenjiajun]

See #2371

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[KevinVandy]

invertSorting as a column option already exists. https://tanstack.com/table/latest/docs/guide/sorting#sorting-direction

sortUndefined as a column option already exists. https://tanstack.com/table/latest/docs/guide/sorting#sort-undefined-or-nullish-values

I do not see any of these changes as necessary.

[tychenjiajun]

What about #2371 (comment) ? I still can't force null or empty values to bottom when sorting using sortUndefined and/or invertSorting, see