feat: add payload to MessageLog (#10)

Author: ex0b1t

src/main/java/com/backbase/mockchannel/MessageLog.java

@@ -1,6 +1,7 @@
 package com.backbase.mockchannel;
 
 import java.time.Instant;
+import java.util.Map;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
@@ -14,4 +15,5 @@ public class MessageLog {
     private int priority;
     private Instant dateSent;
     private Instant dateDelivered;
+    private Map<String, Object> payload;
 }

src/main/java/com/backbase/mockchannel/MockConsumer.java

@@ -24,7 +24,8 @@ public void accept(Message<Map<String,Object>> msg) {
             (String) msg.getHeaders().get("msgChannel"),
             msg.getHeaders().get("msgPriority", Integer.class),
             Optional.ofNullable(msg.getHeaders().getTimestamp()).map(Instant::ofEpochMilli).orElse(null),
-            Instant.now()
+            Instant.now(),
+            msg.getPayload()
         );
         log.info("Message Received: {}", messageLog);
         this.template.convertAndSend("/topic/message-log", messageLog);