Add option to ProxySettings to append guid to mapping file (#838)

* Add option to ProxySettings to append guid to mapping file

* .

* .

* .

examples/WireMockAzureQueueProxy/Program.cs

@@ -0,0 +1,40 @@
+using Newtonsoft.Json;
+using WireMock.Logging;
+using WireMock.Server;
+using WireMock.Settings;
+
+namespace WireMockAzureQueueProxy;
+
+static class Program
+{
+    static void Main(params string[] args)
+    {
+        var server = WireMockServer.Start(new WireMockServerSettings
+        {
+            Logger = new WireMockConsoleLogger(),
+            Urls = new[] { "http://localhost:20001/" },
+            StartAdminInterface = false,
+            ReadStaticMappings = true,
+            WatchStaticMappings = true,
+            WatchStaticMappingsInSubdirectories = true,
+            //ProxyAndRecordSettings = new ProxyAndRecordSettings
+            //{
+            //    Url = "http://127.0.0.1:10001",
+            //    SaveMapping = true,
+            //    SaveMappingToFile = true,
+            //    AppendGuidToSavedMappingFile = true
+            //}
+        });
+
+        System.Console.WriteLine("Press any key to stop the server");
+        System.Console.ReadKey();
+        server.Stop();
+
+        System.Console.WriteLine("Displaying all requests");
+        var allRequests = server.LogEntries;
+        System.Console.WriteLine(JsonConvert.SerializeObject(allRequests, Formatting.Indented));
+
+        System.Console.WriteLine("Press any key to quit");
+        System.Console.ReadKey();
+    }
+}