Fixes #2182: multi-dimensional aggregation + aggregation functions for community sizes #4049
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Fixes #2182
Aggregating function similar to this Cypher function: https://community.neo4j.com/t/listing-the-community-size-of-different-community-detection-algorithms-already-calculated/42895/1
Return type consistent to https://neo4j.com/docs/cypher-manual/current/functions/aggregating functions