refactor: modbusMaster 添加 分部定义

src/adapter/ThingsGateway.Foundation.Modbus/Master/ModbusMaster.cs

@@ -21,7 +21,7 @@ using TouchSocket.Sockets;
 namespace ThingsGateway.Foundation.Modbus;
 
 /// <inheritdoc/>
-public class ModbusMaster : ProtocolBase
+public partial class ModbusMaster : ProtocolBase
 {
     private ModbusTypeEnum modbusType;
 
@@ -387,4 +387,4 @@ internal class DtuPlugin : PluginBase, ITcpReceivingPlugin
         }
         await e.InvokeNext();//如果本插件无法处理当前数据，请将数据转至下一个插件。
     }
-}
+}