Make the GraphQLWebClientImpl public or provide a way to use it on tests

[ignaciolarranaga]

Is your feature request related to a problem? Please describe.
It seems to be no way to create dynamic port tests because there is no way to inject the dynamic port.
I'm trying to do something like https://github.com/graphql-java-kickstart/graphql-spring-webclient/blob/master/graphql-webclient/src/test/java/graphql/kickstart/spring/webclient/boot/GraphQLWebClientTest.java#L36

  @BeforeEach
  void beforeEach() {
    WebClient webClient = WebClient.builder()
        .baseUrl("http://localhost:" + randomServerPort + "/graphql")
        .build();
    graphqlClient = new GraphQLWebClientImpl(webClient, objectMapper);
  }

but seems to be impossible because the classes are package.
Please notice it can not be injected on configuration (that's why I think it was implemented on beforeEach()).

Describe the solution you'd like
Either make the classes and interfaces public or provide an alternative approach.

Describe alternatives you've considered
N/A

Additional context
N/A

[oliemansm]

Good point! I've added a static factory method to GraphQLWebClient, so you can use

GraphQLWebClient.newInstance(webClient, objectMapper)

It's available in the snapshot build for now.