feat: add rich signatures, schema expansion, and examples

Author: mberrishdev

samples/HubDocs.Sample/Hubs/ChatHub.cs

@@ -6,10 +6,27 @@ public interface IChatClient
 {
     Task Connected(string connectionId);
     Task ReceiveMessage(string user, string message);
+    Task ReceiveRichMessage(ChatMessagePayload payload);
     Task UserJoined(string connectionId);
     Task UserLeft(string connectionId);
 }
 
+public enum MessagePriority
+{
+    Low = 0,
+    Normal = 1,
+    High = 2
+}
+
+public class ChatMessagePayload
+{
+    public string User { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+    public MessagePriority Priority { get; set; } = MessagePriority.Normal;
+    public DateTimeOffset SentAt { get; set; } = DateTimeOffset.UtcNow;
+    public List<string> Tags { get; set; } = [];
+}
+
 [HubDocs]
 public class ChatHub : Hub<IChatClient>
 {
@@ -23,6 +40,11 @@ public async Task SendMessage(string user, string message)
         await Clients.All.ReceiveMessage(user, message);
     }
 
+    public async Task SendRichMessage(ChatMessagePayload payload)
+    {
+        await Clients.All.ReceiveRichMessage(payload);
+    }
+
     public async Task JoinRoom(string roomName, List<int> roles)
     {
         await Groups.AddToGroupAsync(Context.ConnectionId, roomName);