Add default implementation to Step#getName

Resolves #4976

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/step/Step.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@
  * @author Mahmoud Ben Hassine
  *
  */
+@FunctionalInterface
 public interface Step {
 
 	/**
@@ -35,9 +36,14 @@ public interface Step {
 	String STEP_TYPE_KEY = "batch.stepType";
 
 	/**
-	 * @return the name of this step.
+	 * The name of the step. This is used to distinguish between different steps and must
+	 * be unique within a job. If not explicitly set, the name will default to the fully
+	 * qualified class name.
+	 * @return the name of the step (never {@code null})
 	 */
-	String getName();
+	default String getName() {
+		return this.getClass().getName();
+	}
 
 	/**
 	 * @return {@code true} if a step that is already marked as complete can be started