Change Executor type for Transport Layer

common/transport/transport-api/src/main/java/org/thingsboard/server/common/transport/TransportContext.java

@@ -47,7 +47,7 @@ public class TransportContext {
 
     @PostConstruct
     public void init() {
-        executor = Executors.newCachedThreadPool();
+        executor = Executors.newWorkStealingPool(50);
     }
 
     @PreDestroy