refactor: decouple system events from command dispatch and add explicit system event handlers and improve gateway handling

rewrite/discordAPI.ts

@@ -68,6 +68,10 @@ export class UnicordDiscordAPI {
         return this.request('POST', path, data);
     }
 
+    async put<T = any>(path: string, data: any): Promise<T> {
+        return this.request('PUT', path, data);
+    }
+
     async patch<T = any>(path: string, data: any): Promise<T> {
         return this.request('PATCH', path, data);
     }