Improved and optimized speedtest

When testing server speed, start the Core for each server and generate the same configuration files as when using the server.
Add a folder binConfigs to store temporary configuration files for Core.

v2rayN/ServiceLib/Handler/CoreConfigHandler.cs

@@ -1,4 +1,4 @@
-namespace ServiceLib.Handler
+namespace ServiceLib.Handler
 {
     /// <summary>
     /// Core configuration file processing class
@@ -109,6 +109,30 @@
             return result;
         }
 
+        public static async Task<RetResult> GenerateClientSpeedtestConfig(Config config, ProfileItem node, ServerTestItem testItem, string fileName)
+        {
+            var result = new RetResult();
+            var initPort = AppHandler.Instance.GetLocalPort(EInboundProtocol.speedtest);
+            var port = Utils.GetFreePort(initPort + testItem.QueueNum);
+            testItem.Port = port;
+
+            if (AppHandler.Instance.GetCoreType(node, node.ConfigType) == ECoreType.sing_box)
+            {
+                result = await new CoreConfigSingboxService(config).GenerateClientSpeedtestConfig(node, port);
+            }
+            else
+            {
+                result = await new CoreConfigV2rayService(config).GenerateClientSpeedtestConfig(node, port);
+            }
+            if (result.Success != true)
+            {
+                return result;
+            }
+
+            await File.WriteAllTextAsync(fileName, result.Data.ToString());
+            return result;
+        }
+
         public static async Task<RetResult> GenerateClientMultipleLoadConfig(Config config, string fileName, List<ProfileItem> selecteds, ECoreType coreType)
         {
             var result = new RetResult();
@@ -129,4 +153,4 @@
             return result;
         }
     }
-}
+}