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/WebSocketMessages/Outbound/GeneralCommandMessage.cs

@@ -0,0 +1,23 @@
+using System.ComponentModel;
+using MediaBrowser.Model.Session;
+
+namespace MediaBrowser.Controller.Net.WebSocketMessages.Outbound;
+
+/// <summary>
+/// General command websocket message.
+/// </summary>
+public class GeneralCommandMessage : WebSocketMessage<GeneralCommand>, IOutboundWebSocketMessage
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="GeneralCommandMessage"/> class.
+    /// </summary>
+    /// <param name="data">The general command.</param>
+    public GeneralCommandMessage(GeneralCommand data)
+        : base(data)
+    {
+    }
+
+    /// <inheritdoc />
+    [DefaultValue(SessionMessageType.GeneralCommand)]
+    public override SessionMessageType MessageType => SessionMessageType.GeneralCommand;
+}