Re: [whatwg/url] Support relative URLs (#531)

my example of coming up with something like a relative URL constructor (b/c NodeJS dose not have an origin or location like deno)

```js
const URLfrom = ((_URL => (origin = 'file://') => {
  return /** @type {typeof URL} */ (Object.assign(function URL(url, base) {
    return new _URL(url, new _URL(base, origin))
  }, _URL))
})(globalThis.URL))

// Example usage:

const RelativeURL = URLfrom('https://httpbin.org')

new RelativeURL('/get').toString() // https://httpbin.org/get
RelativeURL.createObjectURL(new Blob()) 

// More examples:

const RelativeURL = URLfrom(process.cwd() || import.meta.url || 'file://')

new RelativeURL('./readme.md').toString() // file:///Users/username/Projects/relative-url/readme.md
```

or if you just want to have something minimalistic
```js
const url = (url, base) => new URL(url, new URL(base, import.meta.url))
url('./readme.md').toString() // file:///Users/username/Projects/relative-url/readme.md
```

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