XMLHttpRequest to fetch

This isn't really node specific, but XMLHttpRequest has long been all-but-replaced by fetch, and it would be nice to add a migration to allow these legacy codebases to run in modern environments, including Node.js

Before:

const req = new XMLHttpRequest();
req.addEventListener("load", () => console.log(this.responseText));
req.open("GET", "http://www.example.org/example.txt");
req.send();

After:

const req = await fetch("http://example.org");
console.log(req.text());

The issue names no files or tests; start by locating the migration entry point for XMLHttpRequest and reviewing how existing API migrations are tested. Use the supplied before-and-after examples to define the expected transformation, then add coverage showing legacy XMLHttpRequest code can run in modern Node.js with fetch.