fix(trace):ignore IllegalStateException when remove shutdown hook

If shutdown of the JVM in progress already, we don't need to remove the hook, it will be removed by the JVM.

Close #1491

client/src/main/java/org/apache/rocketmq/client/trace/AsyncTraceDispatcher.java

@@ -216,7 +216,11 @@ public class AsyncTraceDispatcher implements TraceDispatcher {
 
     public void removeShutdownHook() {
         if (shutDownHook != null) {
-            Runtime.getRuntime().removeShutdownHook(shutDownHook);
+            try {
+                Runtime.getRuntime().removeShutdownHook(shutDownHook);
+            } catch (IllegalStateException e) {
+                // ignore - VM is already shutting down
+            }
         }
     }