Fixes https://github.com/spring-projects/spring-integration/issues/3936
I am passing request attributes which is getting used in exchangefilter to influence the flow. This request attribute is of type String as Key and Value as a user defined object.
My expectation is to pass this information in request attributes so that it will eventually available in exchangefilter for further processing but i dont find a way to pass these request attribute in webflux integration.
* Add webclient request attributes into `WebFluxRequestExecutingMessageHandler`
* Improve code style and docs
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