judge: support time_limit_rate & memory_limit_rate per problem (#541)

Co-authored-by: panda <panda_dtdyy@outlook.com>

packages/ui-default/components/problemconfig/ProblemConfigEditor.tsx

@@ -31,6 +31,7 @@ const configKey = [
   'memory', 'filename', 'checker_type', 'checker', 'interactor',
   'validator', 'user_extra_files', 'judge_extra_files', 'detail', 'outputs',
   'redirect', 'cases', 'subtasks', 'langs', 'key',
+  'time_limit_rate', 'memory_limit_rate',
 ];
 
 const subtasksKey = [