Add new logic

Added new logic (controlled by the setting enable_producing_buckets_out_of_order_in_aggregation, enabled by default) that allows sending some buckets out of order during memory-efficient aggregation. When some aggregation buckets take significantly longer to merge than others, it improves performance by allowing the initiator to merge buckets with higher bucket id-s in the meantime. The downside is potentially higher memory usage (shouldn't be significant). #80179 (Nikita Taranov).