[3.2] C#: Rewrite GodotTools messaging protocol

modules/mono/editor/GodotTools/GodotTools.IdeMessaging/Message.cs

@@ -0,0 +1,52 @@
+namespace GodotTools.IdeMessaging
+{
+    public class Message
+    {
+        public MessageKind Kind { get; }
+        public string Id { get; }
+        public MessageContent Content { get; }
+
+        public Message(MessageKind kind, string id, MessageContent content)
+        {
+            Kind = kind;
+            Id = id;
+            Content = content;
+        }
+
+        public override string ToString()
+        {
+            return $"{Kind} | {Id}";
+        }
+    }
+
+    public enum MessageKind
+    {
+        Request,
+        Response
+    }
+
+    public enum MessageStatus
+    {
+        Ok,
+        RequestNotSupported,
+        InvalidRequestBody
+    }
+
+    public readonly struct MessageContent
+    {
+        public MessageStatus Status { get; }
+        public string Body { get; }
+
+        public MessageContent(string body)
+        {
+            Status = MessageStatus.Ok;
+            Body = body;
+        }
+
+        public MessageContent(MessageStatus status, string body)
+        {
+            Status = status;
+            Body = body;
+        }
+    }
+}