WebHook : UseFireAndForget + Delay (#803)

* UseFireAndForget

* ...

* delay

* async

* updated code accorsing to proposal

* Change nuget to package reference for WireMock.Net.Console.Net472.Classic, move the new FireAndForget into the main mapping, out of individual webhook mappings making it all or nothing, update tests, change Middleware to await or not the firing of all webhooks. Update models as needed. (#804)

Co-authored-by: Matt Philmon <Matt_Philmon@carmax.com>

* small update

* Tweak middleware and fix bug in example (#806)

Co-authored-by: Matt Philmon <Matt_Philmon@carmax.com>

* .ConfigureAwait(false)

Co-authored-by: mattisking <mattisking@gmail.com>
Co-authored-by: Matt Philmon <Matt_Philmon@carmax.com>

src/WireMock.Net.Abstractions/Admin/Mappings/WebhookRequestModel.cs

@@ -11,12 +11,12 @@ public class WebhookRequestModel
     /// <summary>
     /// Gets or sets the Url.
     /// </summary>
-    public string Url { get; set; }
+    public string Url { get; set; } = null!;
 
     /// <summary>
     /// The method
     /// </summary>
-    public string Method { get; set; }
+    public string Method { get; set; } = null!;
 
     /// <summary>
     /// Gets or sets the headers.
@@ -47,4 +47,19 @@ public class WebhookRequestModel
     /// The ReplaceNodeOptions to use when transforming a JSON node.
     /// </summary>
     public string? TransformerReplaceNodeOptions { get; set; }
+
+    /// <summary>
+    /// Gets or sets the delay in milliseconds.
+    /// </summary>
+    public int? Delay { get; set; }
+
+    /// <summary>
+    /// Gets or sets the minimum random delay in milliseconds.
+    /// </summary>
+    public int? MinimumRandomDelay { get; set; }
+
+    /// <summary>
+    /// Gets or sets the maximum random delay in milliseconds.
+    /// </summary>
+    public int? MaximumRandomDelay { get; set; }
 }