GH-3145 : Sample for next gen consumer-group rebalance protocol

Fixes: #3145 

* Add a sample demonstrating the next-generation consumer-group rebalance protocol.
* Provide a docker-compose script for spinning up a `kraft` based Kafka broker since the new consumer 
  protocol only works in `kraft` mode. 
* Add README explaining the sample.

samples/sample-07/src/main/java/com/example/sample07/Sample07Application.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.sample07;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.kafka.annotation.EnableKafka;
+
+/**
+ * New consumer rebalance protocol sample which purpose is only to demonstrate the application
+ * of the New Consumer Rebalance Protocol in Spring Kafka.
+ *
+ * @author Sanghyeok An.
+ *
+ * @since 3.3
+ */
+
+@EnableKafka
+@SpringBootApplication
+public class Sample07Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Sample07Application.class, args);
+	}
+
+}

samples/sample-07/src/main/java/com/example/sample07/Sample07KafkaListener.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2022-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.sample07;
+
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Component;
+
+/**
+ * New consumer rebalance protocol sample which purpose is only to demonstrate the application
+ * of the New Consumer Rebalance Protocol in Spring Kafka.
+ * Each consumer will subscribe test-topic with different group id.
+ * Then, new consumer rebalance protocol will be completed successfully.
+ *
+ * @author Sanghyeok An.
+ *
+ * @since 3.3
+ */
+
+@Component
+public class Sample07KafkaListener {
+
+	@KafkaListener(topics = "test-topic", groupId = "sample07-1")
+	public void listenWithGroup1(String message) {
+		System.out.println("Received message at group sample07-1: " + message);
+	}
+
+	@KafkaListener(topics = "test-topic", groupId = "sample07-2")
+	public void listenWithGroup2(String message) {
+		System.out.println("Received message at group sample07-2: " + message);
+	}
+}

samples/sample-07/src/main/resources/application.yaml

@@ -0,0 +1,17 @@
+spring:
+  docker:
+    compose:
+      lifecycle-management: start_and_stop
+      start:
+        command: up
+      stop:
+        command: down
+        timeout: 10s
+  kafka:
+    consumer:
+      bootstrap-servers: localhost:10000
+      group-id: sample07
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      properties:
+        group.protocol: consumer