feature: Stop heartbeat detection when dapr stops (#343)

Author: zhenlei520

src/Contrib/Development/Masa.Contrib.Development.DaprStarter/DaprProcess.cs

@@ -77,6 +77,10 @@ private void StartCore(DaprCoreOptions options)
             _heartBeatTimer.Elapsed += (_, _) => HeartBeat();
             _heartBeatTimer.Start();
         }
+        else
+        {
+            _heartBeatTimer?.Start();
+        }
     }
 
     public void CompleteDaprEnvironment(ushort? httpPort, ushort? grpcPort)
@@ -114,6 +118,7 @@ public void Stop()
         lock (_lock)
         {
             StopCore(SuccessDaprOptions);
+            _heartBeatTimer?.Stop();
         }
     }