feat: 通信协议相关字段

plugin/plugin.go

 package plugin
 
 const (
-	PluginStartFunction     = "start"
-	PluginStopFunction      = "stop"
-	PluginConfigFunction    = "applyConfiguration"
-	PluginKeepAliveFunction = "keepAlive"
+	PluginFunctionStart  = "start"
+	PluginFunctionStop   = "stop"
+	PluginFunctionConfig = "applyConfiguration"
+
+	PluginReturnCodeSuccess = 0
+	PluginReturnCodeFailed  = 1
+
+	PluginMsgTypeKeepAlive = "keepAliveMsg"
+	PluginMsgTypeService   = "serviceMsg"
 )