docs: add array_agg_if aggregate function doc - #4117
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Add English and Chinese current-version docs for the new array_agg_if aggregate function (cond-first, keeps NULL elements, empty array when no row matches), with examples.
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Add English and Chinese documentation for the new
array_agg_ifaggregate function.array_agg_if(cond, col)concatenates the values of rows whose condition is true into an array. Rows whose condition is false or NULL are skipped entirely; when the condition is true, NULL values are kept as NULL elements; an empty array is returned when no row matches.