Prevent eager initialization of beans using getBeanNamesForAnnotation

Fixes #513

Author: ST-DDT

grpc-server-spring-boot-autoconfigure/src/main/java/net/devh/boot/grpc/server/advice/GrpcAdviceIsPresentCondition.java

@@ -42,7 +42,7 @@ public ConfigurationPhase getConfigurationPhase() {
     public boolean matches(final ConditionContext context, final AnnotatedTypeMetadata metadata) {
         final ConfigurableListableBeanFactory safeBeanFactory =
                 requireNonNull(context.getBeanFactory(), "ConfigurableListableBeanFactory is null");
-        return !safeBeanFactory.getBeansWithAnnotation(GrpcAdvice.class).isEmpty();
+        return safeBeanFactory.getBeanNamesForAnnotation(GrpcAdvice.class).length != 0;
     }
 
 }