📍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>

thread-pool/src/test/java/com/iluwatar/threadpool/WorkerTest.java

@@ -41,7 +41,7 @@ public class WorkerTest {
    * Verify if a worker does the actual job
    */
   @Test
-  public void testRun() {
+  void testRun() {
     final var task = mock(Task.class);
     final var worker = new Worker(task);
     verifyZeroInteractions(task);