Search-kit - allow functions in the GROUP BY clause

@colemanw I was hoping the answer to https://github.com/eileenmcnaughton/nz.co.fuzion.extendedreport/issues/465 might be 'use search-kit' - but it seems reports allows the opportunity to include functions when grouping by date - eg

YEAR(receive_date)

Edited May 11, 2022 by colemanw

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