📍Use lombok, reformat, and optimize the code (#1560)

* Use lombok, reformat, and optimize the code

* Fix merge conflicts and some sonar issues

Co-authored-by: va1m <va1m@email.com>

event-driven-architecture/src/main/java/com/iluwatar/eda/model/User.java

@@ -25,20 +25,16 @@ package com.iluwatar.eda.model;
 
 import com.iluwatar.eda.event.UserCreatedEvent;
 import com.iluwatar.eda.event.UserUpdatedEvent;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * This {@link User} class is a basic pojo used to demonstrate user data sent along with the {@link
  * UserCreatedEvent} and {@link UserUpdatedEvent} events.
  */
+@RequiredArgsConstructor
+@Getter
 public class User {
 
   private final String username;
-
-  public User(String username) {
-    this.username = username;
-  }
-
-  public String getUsername() {
-    return username;
-  }
 }