[Backport 8.13] Add misc improvements to the framework #761
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Adds a number of improvements and bugfixes to the JSON and utility classes: JSON framework: * A new `BufferingJsonpMapper` allows the creation of `JsonGenerator` that store JSON events in a buffer that can be replayed. This is useful to efficiently create synthetic JSON documents. * An additional `JsonpMapper.deserialize` method variant accepts the current JSON event. Fixes #741 * The Jackson implementation of `JsonpMapper` now enables the `ACCEPT_SINGLE_VALUE_AS_ARRAY` deserialization feature. This allows single values in a JSON stream to be considered as a single-value collection. API & transport framework: * `ElasticsearchException` now holds the low level http response, so that the application can inspect the details of the error. * Endpoints now have a `call` methods, to make calling endpoints programmatically easier. This is for advanced use, as an application will normally use the `ElasticsearchClient` that hides endpoint objects. * A `BinaryDataResponse` can now easily be created from a byte array. Test framework: * The `ElasticsearchTestServer` now tries to contact an Elasticsearch server running on `http://elastic:changeme@localhost:9200` before spawning a container. * A `MockHttpClient` has been added that allows writing integration-like tests without requiring a running server. This is an alternative to using `com.sun.net.httpserver.HttpServer` when we want to test http response decoding but don't need to test the network layer.
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Backport b5aed69 from #760