Allow body access like RequestBodyAdvice/ResponseBodyAdvice in RestClient

[kk-mats]

** Enhancements requests **
In Spring mvc, RequestBodyAdvice and ResponseBodyAdvice are provided to access and manipulate java objects of message bodies before serialization of incoming requests/after deserialization of outgoing responses.

While they are useful for implementing common logic requiring body data such as logging or customization, RestClient does not have any equivalent feature to do so.

ClientHttpRequestInterceptor is a bit similar but it allows access to only byte array representation of body data.

[rstoyanchev]

The advice contracts are not really intended or suitable for logging of the request and response body content. It's not clear what you want to do that you can't.

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