Add WebSockets (#1423)

* Add WebSockets

* Add tests

* fix

* more tests

* Add tests

* ...

* remove IOwin

* -

* tests

* fluent

* ok

* match

* .

* byte[]

* x

* func

* func

* byte

* trans

* ...

* frameworks.........

* jmes

* xxx

* sc

src/WireMock.Net.Minimal/WebSockets/WebSocketTransformModel.cs

@@ -0,0 +1,29 @@
+// Copyright © WireMock.Net
+
+namespace WireMock.WebSockets;
+
+/// <summary>
+/// Model for WebSocket message transformation
+/// </summary>
+internal struct WebSocketTransformModel
+{
+    /// <summary>
+    /// The mapping that matched this WebSocket request
+    /// </summary>
+    public IMapping Mapping { get; set; }
+
+    /// <summary>
+    /// The original request that initiated the WebSocket connection
+    /// </summary>
+    public IRequestMessage Request { get; set; }
+
+    /// <summary>
+    /// The incoming WebSocket message
+    /// </summary>
+    public WebSocketMessage Message { get; set; }
+
+    /// <summary>
+    /// The message data as string
+    /// </summary>
+    public string? Data { get; set; }
+}