judge: add multi-pass problem support (#1167)

packages/common/types.ts

@@ -56,6 +56,7 @@ export interface ProblemConfigFile {
     cases?: TestCaseConfig[];
     subtasks?: SubtaskConfig[];
     langs?: string[];
+    multi_pass?: number;
     checker?: CompilableSource;
     interactor?: CompilableSource;
     manager?: CompilableSource;