fix: add SQLExpressions.stringAgg and ensure proper spacing for WITHI…#1258

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renechoi:Fix/correct-SQL-for-string_agg-WITHIN-GROUP-ORDER-BY-via-SQLExpressions.stringAggrenechoi/querydsl:Fix/correct-SQL-for-string_agg-WITHIN-GROUP-ORDER-BY-via-SQLExpressions.stringAggCopy head branch name to clipboard