📍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>

monostate/src/test/java/com/iluwatar/monostate/AppTest.java

@@ -31,7 +31,7 @@ import org.junit.jupiter.api.Test;
 public class AppTest {
 
   @Test
-  public void testMain() {
+  void testMain() {
     App.main(new String[]{});
   }
 

monostate/src/test/java/com/iluwatar/monostate/LoadBalancerTest.java

@@ -43,7 +43,7 @@ import org.junit.jupiter.api.Test;
 public class LoadBalancerTest {
 
   @Test
-  public void testSameStateAmongstAllInstances() {
+  void testSameStateAmongstAllInstances() {
     final var firstBalancer = new LoadBalancer();
     final var secondBalancer = new LoadBalancer();
     firstBalancer.addServer(new Server("localhost", 8085, 6));
@@ -54,7 +54,7 @@ public class LoadBalancerTest {
   }
 
   @Test
-  public void testServe() {
+  void testServe() {
     final var server = mock(Server.class);
     when(server.getHost()).thenReturn("testhost");
     when(server.getPort()).thenReturn(1234);