Add support for `org.springframework.web.client.RestClient`

[donalmurtagh]

The latest HTTP client for testing a Spring application is org.springframework.web.client.RestClient, but according to the docs it is not currently supported by spring-restdocs.

For most use cases, RestClient is a better choice than WebClient/WebTestClient as the latter imposes a reactive API and a dependency on Spring WebFlux.

[wilkinsona]

Thanks for the suggestion but this would require a test-focussed variant of RestClient (like WebTestClient is to WebClient). That's being tracked by spring-projects/spring-framework#31275. Until that's implemented, there's nothing that can be done here so I'm going to close this issue as it's not actionable at the moment and may never be actionable.