Implement support of Percentile Ranks aggregation

[nebrass]

Percentile ranks aggregation

A multi-value metrics aggregation that calculates one or more percentile ranks over numeric values extracted from the aggregated documents. These values can be generated by a provided script or extracted from specific numeric or histogram fields in the documents.

Please see Percentiles are (usually) approximate and Compression for advice regarding approximation and memory use of the percentile ranks aggregation

Percentile rank show the percentage of observed values which are below certain value. For example, if a value is greater than or equal to 95% of the observed values it is said to be at the 95th percentile rank.

https://www.elastic.co/guide/en/elasticsearch/reference/7.10/search-aggregations-metrics-percentile-rank-aggregation.html