Register all public methods of lambda handlers for query

Needed in order to detect the handle method at runtime using
`getMethods()`. Without a
`org.graalvm.nativeimage.MissingReflectionRegistrationError` being
thrown when using `-H:ThrowMissingRegistrationErrors=`

Related to quarkusio#41995

Author: zakkak

extensions/amazon-lambda/deployment/src/main/java/io/quarkus/amazon/lambda/deployment/AmazonLambdaProcessor.java

@@ -115,7 +115,7 @@ List<AmazonLambdaBuildItem> discover(CombinedIndexBuildItem combinedIndexBuildIt
             final String lambda = name.toString();
             builder.addBeanClass(lambda);
             reflectiveClassBuildItemBuildProducer
-                    .produce(ReflectiveClassBuildItem.builder(lambda).methods().build());
+                    .produce(ReflectiveClassBuildItem.builder(lambda).methods().queryPublicMethods().build());
 
             String cdiName = null;
             AnnotationInstance named = info.declaredAnnotation(NAMED);