Re: [whatwg/url] size (or length) for URLSearchParams (#163)

Sorry to show up towing a bikeshed, but how about
```idl
unsigned long count(optional USVString key, optional USVString value);
```
allowing you to do
```js
const p = new URLSearchParams('a=1&b=2&b=3&b=3');
p.count();  // 4
p.count('b');  // 3
p.count('b', '3');  // 2
```
?

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