core&ui&elastic: support elastic search and allow search result pagination

packages/hydrooj/src/model/task.ts

@@ -72,7 +72,7 @@ class WorkerService implements BaseService {
                 const start = Date.now();
                 await Promise.race([
                     this.handlers[doc.subType](doc),
-                    new Promise((resolve) => setTimeout(resolve, 300000)),
+                    sleep(300000),
                 ]);
                 const spent = Date.now() - start;
                 if (spent > 500) logger.warn('Slow worker task (%d ms): %s', spent, doc);