📍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>

chain/README.md

@@ -68,8 +68,8 @@ public enum RequestType {
 Then the request handler hierarchy
 
 ```java
+@Slf4j
 public abstract class RequestHandler {
-  private static final Logger LOGGER = LoggerFactory.getLogger(RequestHandler.class);
   private final RequestHandler next;
 
   public RequestHandler(RequestHandler next) {