Use GroupsAccumulator exclusively in grouped hash aggregation #175
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Makes other AggregateExprs in use GroupsAccumulatorFlatAdapter, and also uses a GroupsAccumulator implementation that has Box<dyn Accumulator> inside as a fallback accumulator if some AggregateExpr implementation does not support that. This fully removes a batch keys and hash table iteration and brings that performance benefit from Sum and Avg to other aggregation types.
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Makes other AggregateExprs in use GroupsAccumulatorFlatAdapter, and also uses a GroupsAccumulator implementation that has Box inside as a fallback accumulator if some AggregateExpr implementation does not support that.
This fully removes a batch keys and hash table iteration and brings that performance benefit from Sum and Avg to other aggregation types.