feat: handle and forward WEBHOOKS_UPDATE events (#2762)

* src: Handle WEBHOOK_UPDATE events

* Commit rename of 77'
Or adding the letter S

* I missed this

* Properly do this now
Typos everywhere

* Typings

* refactor: remove now unnecessary guild variable

src/util/Constants.js

@@ -249,6 +249,7 @@ exports.Events = {
   VOICE_BROADCAST_UNSUBSCRIBE: 'unsubscribe',
   TYPING_START: 'typingStart',
   TYPING_STOP: 'typingStop',
+  WEBHOOKS_UPDATE: 'webhookUpdate',
   DISCONNECT: 'disconnect',
   RECONNECTING: 'reconnecting',
   ERROR: 'error',
@@ -290,6 +291,7 @@ exports.Events = {
  * * VOICE_STATE_UPDATE
  * * TYPING_START
  * * VOICE_SERVER_UPDATE
+ * * WEBHOOKS_UPDATE
  * @typedef {string} WSEventType
  */
 exports.WSEvents = keyMirror([
@@ -324,6 +326,7 @@ exports.WSEvents = keyMirror([
   'VOICE_STATE_UPDATE',
   'TYPING_START',
   'VOICE_SERVER_UPDATE',
+  'WEBHOOKS_UPDATE',
 ]);
 
 /**