feat(Interactions): add InteractionWebhook for better internals (#5712)

src/client/WebhookClient.js

@@ -24,6 +24,19 @@ class WebhookClient extends BaseClient {
     this.id = id;
     Object.defineProperty(this, 'token', { value: token, writable: true, configurable: true });
   }
+
+  // These are here only for documentation purposes - they are implemented by Webhook
+  /* eslint-disable no-empty-function */
+  send() {}
+  sendSlackMessage() {}
+  fetchMessage() {}
+  edit() {}
+  editMessage() {}
+  delete() {}
+  deleteMessage() {}
+  get createdTimestamp() {}
+  get createdAt() {}
+  get url() {}
 }
 
 Webhook.applyToClass(WebhookClient);