* GH-3529: Add HTTP & WebFlux extractResponseBody
Fixes https://github.com/spring-projects/spring-integration/issues/3529
* Expose a convenient `extractResponseBody` option on the HTTP client components
to let end-user to decide if the body of `ResponseEntity` must be extracted (default)
or the whole `ResponseEntity` should be produced as a reply message payload
* Remove a deprecated since `5.3` `encode-uri` option
* Document the new feature
* Rework `webflux.adoc` chapter for the code snippet switcher
* * Fix language in Docs
* Mention a default value in JavaDocs
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