[Backport 8.13] Add ES|QL helpers #763
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Adds helpers for ES|QL. The ES|QL result format is meant to be compact: it is composed of a metadata part giving field names and their types and a 2D array of values, which isn't easy to use in application code. This PR provides adapters that convert the ES|QL JSON result format into higher level types that are easier to use. Two adapters are provided: * An `ObjectsAdatper` that combines field names and values from the array to build a collection of objects using JSON to object mapping * A `ResultSetAdpater` that provides an implementation of the well-known JDBC `ResultSet`. This is a cursor-based API where the application can inspect at runtime the type and names of the ES|QL results, and is therefore more suited for ad-hoc or dynamic queries where the result structure isn't known in advance. Along with adapters, additional methods in `ElasticsearchEsqlClient` provide simple way to send queries using just a string and optional parameters when you don't need to specify additional request details.
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Backport d1dfacd from #762