Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/ajv/dist/compile/ref_error.d.ts

@@ -0,0 +1,6 @@
+import type { UriResolver } from "../types";
+export default class MissingRefError extends Error {
+    readonly missingRef: string;
+    readonly missingSchema: string;
+    constructor(resolver: UriResolver, baseId: string, ref: string, msg?: string);
+}