Lens charts that use Top N nested aggs get faster with ES|QL
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Description
**Value Proposition**
Lens has an extremely popular feature "Breakdown" by "Top X values of ". These can be nested in multiple layers, for example "Top 3 error codes from the 5 servers with the most log entries, in hourly buckets". This relies on hierarchical aggregation capability of our classic aggregations framework that ES|QL does not yet offer. If we support this with ES|QL we should be able to migrate more Lens charts to ES|QL and we'd expect them to perform faster due to ES|QL's compute engine, and potentially be more accurate, as classic aggs makes accuracy tradeoffs to accomplish this.
**Expected Outcome**
More Lens charts can use ES|QL because they'll be able to include the popular "top N" bucketed aggregations, removing another impediment to migrating all Lens visualizations to ES|QL.
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