[core] Add distinct parameter for FieldListaggAgg #6564
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Purpose
Add distinct support to FileListagg aggregate function.
fields.{fieldName}.distinctoptionarray.collect.distinct,map.merge_mapTests
org.apache.paimon.mergetree.compact.aggregate.FieldAggregatorTest#testFieldListAggWithDefaultDelimiterAndDistinct
API and Format
fields.{fieldName}.distinctoptionDocumentation