docs(examples): Add Logging and Tracing to idempotency example with correct config

examples/powertools-examples-core-utilities/kotlin/.gitignore

@@ -0,0 +1 @@
+bin/

examples/powertools-examples-idempotency/src/main/java/helloworld/App.java

@@ -34,6 +34,7 @@
 import software.amazon.lambda.powertools.idempotency.Idempotent;
 import software.amazon.lambda.powertools.idempotency.persistence.dynamodb.DynamoDBPersistenceStore;
 import software.amazon.lambda.powertools.logging.Logging;
+import software.amazon.lambda.powertools.tracing.Tracing;
 import software.amazon.lambda.powertools.utilities.JsonConfig;
 
 public class App implements RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {
@@ -91,6 +92,7 @@ public App(DynamoDbClient client) {
      */
     @Idempotent // The magic is here!
     @Logging(logEvent = true)
+    @Tracing
     public APIGatewayProxyResponseEvent handleRequest(final APIGatewayProxyRequestEvent input, final Context context) {
         Map<String, String> headers = new HashMap<>();
 
@@ -130,6 +132,7 @@ public APIGatewayProxyResponseEvent handleRequest(final APIGatewayProxyRequestEv
      * @return The contents of the given URL
      * @throws IOException
      */
+    @Tracing
     private String getPageContents(String address) throws IOException {
         URL url = new URL(address);
         try (BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8))) {

examples/powertools-examples-idempotency/src/main/resources/log4j2.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration>
+    <Appenders>
+        <Console name="JsonAppender" target="SYSTEM_OUT">
+            <JsonTemplateLayout eventTemplateUri="classpath:LambdaJsonLayout.json" />
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Logger name="JsonLogger" level="INFO" additivity="false">
+            <AppenderRef ref="JsonAppender" />
+        </Logger>
+        <Root level="info">
+            <AppenderRef ref="JsonAppender" />
+        </Root>
+    </Loggers>
+</Configuration>