core&ui: add problems gql to fix autocomplete (#389)

packages/hydrooj/src/handler/problem.ts

@@ -80,6 +80,11 @@ registerResolver(
         return pdoc;
     },
 );
+registerResolver('Query', 'problems(ids: [Int])', '[Problem]', async (arg, ctx) => {
+    const res = await problem.getList(ctx.args.domainId, arg.ids, ctx.user.hasPerm(PERM.PERM_VIEW_PROBLEM_HIDDEN) || ctx.user._id,
+        ctx.user.group, undefined, undefined, true);
+    return Object.keys(res).map((id) => res[+id]);
+}, 'Get a list of problem by ids');
 registerResolver(
     'Problem', 'manage', 'ProblemManage',
     (arg, ctx) => {