[whatwg/url] Invoking serializer "exclude fragment" from API (#628)

This is a bit of a long shot, but I figured I'd ask...

I found myself needing to serialize a URL via the API, but with "[exclude fragment](https://url.spec.whatwg.org/#url-serializer-exclude-fragment)" being true. 

I'm wondering, could we overload the serializer to accept `{excludeFragment: true}`... imagine something like:

```JS
const str = url.toString({ excludeFragment: true });
const json = url.toJSON({ excludeFragment: true });
```

It's a bit unconventional, but taking the optional argument would be nice for completeness. 

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