[I] [Feature] Add distinct parameter support to FieldListaggAgg operator [paimon]

["759434091 (via GitHub)" <gi...@apache.org>]

759434091 opened a new issue, #6567:
URL: https://github.com/apache/paimon/issues/6567

   ### Search before asking
   
   - [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.
   
   
   ### Motivation
   
   Users often store complex data such as `user1, user2, user3` as simple string rather then complex date type (map,array).
   When aggregating these fields, there is currently no support for deduplication `set.add`.
   
   
   ### Solution
   
   Add a `distinct` option support to FieldListAgg?
   
   ### Anything else?
   
   This approach works fine for `user1,user2,user3`, but it's insufficient for kv-string deduplication (k1=v1;k2=v2). I'm not sure whether to handle this with string manipulation or a map-merge aggregation approach.
   
   
   
   ### Are you willing to submit a PR?
   
   - [ ] I'm willing to submit a PR!


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