Update to Spring Boot 3.2 and added a RestClient based GraphQLClient

[paulbakker]

Pull Request type

• Bugfix
• Feature
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Changes in this PR

Update to Spring Boot 3.2 and added a RestClientGraphQLClient, using Spring's new RestClient.
This is a blocking client with a similar API to WebClient, but without anything Reactive.

Example use:

@Autowired
RestClient.Builder restClientBuilder;

String helloRequest() {
   RestClient restClient = restClientBuilder.baseUrl("http://localhost:8080/graphql").build();
   RestClientGraphQLClient client = new RestClientGraphQLClient(restClient);
   return client.executeQuery("{hello}").extractValue<String>("hello");
}

[srinivasankavitha]

Did this change?

[paulbakker]

The rawStatusCode doesn't exist anymore in Spring.