Add all websocket messages to generated openapi spec (#9682)

* Add all websocket messages to generated openapi spec

* Use oneOf

* JsonIgnore ServerId

* Oops

* Add discriminators

* Add WebSocketMessage container for Inbound and Outbound messages

MediaBrowser.Controller/Net/WebSocketMessageOfT.cs

@@ -0,0 +1,33 @@
+#pragma warning disable SA1649 // File name must equal class name.
+
+namespace MediaBrowser.Controller.Net;
+
+/// <summary>
+/// Class WebSocketMessage.
+/// </summary>
+/// <typeparam name="T">The type of the data.</typeparam>
+// TODO make this abstract, remove empty ctor.
+public class WebSocketMessage<T> : WebSocketMessage
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WebSocketMessage{T}"/> class.
+    /// </summary>
+    public WebSocketMessage()
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WebSocketMessage{T}"/> class.
+    /// </summary>
+    /// <param name="data">The data to send.</param>
+    protected WebSocketMessage(T data)
+    {
+        Data = data;
+    }
+
+    /// <summary>
+    /// Gets or sets the data.
+    /// </summary>
+    // TODO make this set only.
+    public T? Data { get; set; }
+}