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.Model/Net/WebSocketMessage.cs

@@ -1,31 +0,0 @@
-#nullable disable
-#pragma warning disable CS1591
-
-using System;
-using MediaBrowser.Model.Session;
-
-namespace MediaBrowser.Model.Net
-{
-    /// <summary>
-    /// Class WebSocketMessage.
-    /// </summary>
-    /// <typeparam name="T">The type of the data.</typeparam>
-    public class WebSocketMessage<T>
-    {
-        /// <summary>
-        /// Gets or sets the type of the message.
-        /// </summary>
-        /// <value>The type of the message.</value>
-        public SessionMessageType MessageType { get; set; }
-
-        public Guid MessageId { get; set; }
-
-        public string ServerId { get; set; }
-
-        /// <summary>
-        /// Gets or sets the data.
-        /// </summary>
-        /// <value>The data.</value>
-        public T Data { get; set; }
-    }
-}