feature(worker): catch errors from runProcessLoop and shutdown

src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/Worker.java

@@ -489,13 +489,16 @@ public class Worker implements Runnable {
             shutdown();
         }
 
+        try {
             while (!shouldShutdown()) {
                 runProcessLoop();
             }
-
+        }
+        finally {
             finalShutdown();
             LOG.info("Worker loop is complete. Exiting from worker.");
         }
+    }
 
     @VisibleForTesting
     void runProcessLoop() {