DATAREST-866 - Avoid premature initialization of RepositoryRestMvcConfiguration.

Previously, RepositoryRestMvcConfiguration declared a BeanPostProcessor instance in a non-static bean factory method. That required Spring to instantiate the configuration class and keeping it in uninitialized state, which could in turn cause issues downstream.

We now use a static method so that the container can obtain the bean instance without having to create an instance of the configuration class and thus deferring its initialization.

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.java

@@ -273,7 +273,8 @@ public class RepositoryRestMvcConfiguration extends HateoasAwareSpringDataWebCon
 	}
 
 	@Bean
-	public ProjectionDefinitionRegistar projectionDefinitionRegistrar(ObjectFactory<RepositoryRestConfiguration> config) {
+	public static ProjectionDefinitionRegistar projectionDefinitionRegistrar(
+			ObjectFactory<RepositoryRestConfiguration> config) {
 		return new ProjectionDefinitionRegistar(config);
 	}