Assign ownership to many libs files (#6928)

Assign ownership to many of the remaining libs/common files.

Criteria for ownership:
* Files used by a single team, is now owned by that team.
* Files related to a domain owned by a team is now owned by that team.
* Where ownership is unclear the "lowest level" service takes ownership.

libs/node/src/node-utils.ts

@@ -0,0 +1,34 @@
+import * as fs from "fs";
+import * as path from "path";
+import * as readline from "readline";
+
+export class NodeUtils {
+  static mkdirpSync(targetDir: string, mode = "700", relative = false, relativeDir: string = null) {
+    const initialDir = path.isAbsolute(targetDir) ? path.sep : "";
+    const baseDir = relative ? (relativeDir != null ? relativeDir : __dirname) : ".";
+    targetDir.split(path.sep).reduce((parentDir, childDir) => {
+      const dir = path.resolve(baseDir, parentDir, childDir);
+      if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir, mode);
+      }
+      return dir;
+    }, initialDir);
+  }
+  static readFirstLine(fileName: string) {
+    return new Promise<string>((resolve, reject) => {
+      const readStream = fs.createReadStream(fileName, { encoding: "utf8" });
+      const readInterface = readline.createInterface(readStream);
+      readInterface
+        .on("line", (line) => {
+          readStream.close();
+          resolve(line);
+        })
+        .on("error", (err) => reject(err));
+    });
+  }
+
+  // https://stackoverflow.com/a/31394257
+  static bufferToArrayBuffer(buf: Buffer): ArrayBuffer {
+    return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength);
+  }
+}