refactor: move ts-circular-dependencies tool to dev-infra (#35647)

PR Close #35647

dev-infra/ts-circular-dependencies/file_system.ts

@@ -0,0 +1,23 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Stats, statSync} from 'fs';
+
+/** Gets the status of the specified file. Returns null if the file does not exist. */
+export function getFileStatus(filePath: string): Stats|null {
+  try {
+    return statSync(filePath);
+  } catch {
+    return null;
+  }
+}
+
+/** Ensures that the specified path uses forward slashes as delimiter. */
+export function convertPathToForwardSlash(path: string) {
+  return path.replace(/\\/g, '/');
+}