[whatwg/url] Support repeated names (#206)

https://url.spec.whatwg.org/commit-snapshots/31ddc5bd0c4ca1b6d837029c926ec87bc472c168/#example-constructing-urlsearchparams

> Otherwise, if init is a record, then for each mapping \(name, value\) in init, append a new name\-value pair whose name is name and value is value, to query’s list\.

I propose to also add support for multiple values

```js
new URLSearchParams({ x: ['1', '2'], y: 3 });
// x=1&x=2&y=3
```

Basically: when value is an array, for each item in that array, add a new name-value pair whose name is name and value is that item

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