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/Mapping.cs

@@ -63,6 +63,9 @@ public class Mapping : IMapping
     /// <inheritdoc />
     public IWebhook[]? Webhooks { get; }
 
+    /// <inheritdoc />
+    public bool? UseWebhooksFireAndForget { get; set; }
+
     /// <inheritdoc />
     public ITimeSettings? TimeSettings { get; }
 
@@ -82,6 +85,7 @@ public class Mapping : IMapping
     /// <param name="nextState">The next state which will occur after the current mapping execution. [Optional]</param>
     /// <param name="stateTimes">Only when the current state is executed this number, the next state which will occur. [Optional]</param>
     /// <param name="webhooks">The Webhooks. [Optional]</param>
+    /// <param name="useWebhooksFireAndForget">Use Fire and Forget for the defined webhook(s). [Optional]</param>
     /// <param name="timeSettings">The TimeSettings. [Optional]</param>
     public Mapping(
         Guid guid,
@@ -97,6 +101,7 @@ public class Mapping : IMapping
         string? nextState,
         int? stateTimes,
         IWebhook[]? webhooks,
+        bool? useWebhooksFireAndForget,
         ITimeSettings? timeSettings)
     {
         Guid = guid;
@@ -112,6 +117,7 @@ public class Mapping : IMapping
         NextState = nextState;
         StateTimes = stateTimes;
         Webhooks = webhooks;
+        UseWebhooksFireAndForget = useWebhooksFireAndForget;
         TimeSettings = timeSettings;
     }