feat: Support the WEBHOOKS_UPDATED event (#2384)

Co-authored-by: Armano den Boef <68127614+Rozen4334@users.noreply.github.com>

src/Discord.Net.WebSocket/API/Gateway/WebhooksUpdatedEvent.cs

@@ -0,0 +1,13 @@
+using Newtonsoft.Json;
+
+namespace Discord.API.Gateway
+{
+    internal class WebhooksUpdatedEvent
+    {
+        [JsonProperty("guild_id")]
+        public ulong GuildId { get; set; }
+
+        [JsonProperty("channel_id")]
+        public ulong ChannelId { get; set; }
+    }
+}

src/Discord.Net.WebSocket/BaseSocketClient.Events.cs

@@ -877,5 +877,20 @@ namespace Discord.WebSocket
         }
         internal readonly AsyncEvent<Func<SocketCustomSticker, Task>> _guildStickerDeleted = new AsyncEvent<Func<SocketCustomSticker, Task>>();
         #endregion
+
+        #region Webhooks
+
+        /// <summary>
+        ///     Fired when a webhook is modified, moved, or deleted. If the webhook was
+        ///     moved the channel represents the destination channel, not the source.
+        /// </summary>
+        public event Func<SocketGuild, SocketChannel, Task> WebhooksUpdated
+        {
+            add { _webhooksUpdated.Add(value); }
+            remove { _webhooksUpdated.Remove(value); }
+        }
+        internal readonly AsyncEvent<Func<SocketGuild, SocketChannel, Task>> _webhooksUpdated = new AsyncEvent<Func<SocketGuild, SocketChannel, Task>>();
+
+        #endregion
     }
 }

src/Discord.Net.WebSocket/DiscordShardedClient.cs

@@ -496,6 +496,8 @@ namespace Discord.WebSocket
             client.GuildScheduledEventStarted += (arg) => _guildScheduledEventStarted.InvokeAsync(arg);
             client.GuildScheduledEventUserAdd += (arg1, arg2) => _guildScheduledEventUserAdd.InvokeAsync(arg1, arg2);
             client.GuildScheduledEventUserRemove += (arg1, arg2) => _guildScheduledEventUserRemove.InvokeAsync(arg1, arg2);
+
+            client.WebhooksUpdated += (arg1, arg2) => _webhooksUpdated.InvokeAsync(arg1, arg2);
         }
         #endregion
 

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -2839,6 +2839,23 @@ namespace Discord.WebSocket
 
                             #endregion
 
+                            #region Webhooks
+
+                            case "WEBHOOKS_UPDATE":
+                                {
+                                    var data = (payload as JToken).ToObject<WebhooksUpdatedEvent>(_serializer);
+                                    type = "WEBHOOKS_UPDATE";
+                                    await _gatewayLogger.DebugAsync("Received Dispatch (WEBHOOKS_UPDATE)").ConfigureAwait(false);
+
+                                    var guild = State.GetGuild(data.GuildId);
+                                    var channel = State.GetChannel(data.ChanelId);
+
+                                    await TimedInvokeAsync(_webhooksUpdated, nameof(WebhooksUpdated), guild, channel);
+                                }
+                                break;
+
+                            #endregion
+
                             #region Ignored (User only)
                             case "CHANNEL_PINS_ACK":
                                 await _gatewayLogger.DebugAsync("Ignored Dispatch (CHANNEL_PINS_ACK)").ConfigureAwait(false);
@@ -2858,9 +2875,6 @@ namespace Discord.WebSocket
                             case "USER_SETTINGS_UPDATE":
                                 await _gatewayLogger.DebugAsync("Ignored Dispatch (USER_SETTINGS_UPDATE)").ConfigureAwait(false);
                                 break;
-                            case "WEBHOOKS_UPDATE":
-                                await _gatewayLogger.DebugAsync("Ignored Dispatch (WEBHOOKS_UPDATE)").ConfigureAwait(false);
-                                break;
                             #endregion
 
                             #region Others