ES|QL approximate query execution

[jan-elastic]

First version of approximate query execution

For more details, see:

• what this is targeting: class-level JavaDoc of Approximate.java
• implementation details: JavaDoc of Approximate::approximatePlan and other comments
• example use cases: the CSV tests

You can use this currently as follows

    SET approximate=true;
    FROM kibana_sample_data_ecommerce
     | STATS count=COUNT() BY CATEGORIZE(category)
     | SORT count DESC

but the final API will look differently (probably SET command in the ES|QL query)

[elasticsearchmachine]

Pinging @elastic/ml-core (Team:ML)

[elasticsearchmachine]

Hi @jan-elastic, I've created a changelog YAML for you.

[github-actions[bot]]

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