[whatwg/url] Convenience method for serializing (#142)

It'd be great to have a simple static method to go from key-value data to a formatted string in a single step:

```
// the idiomatic way to express kv data in JS
type dict = { [key: string]: string };

class URLSearchParams {
  static toQueryString(params: URLSearchParams | dict): string;
}
```

This'd allow for idiomatic composition with other core JS APIs, matching the pleasant developer experience that people expect:

```
// creating
const queries = [{ k1: "v1"}, { k1: "v2" }]
const results = queries
  .map(URLSearchParams.toQueryString)
  .map(qs => fetch(someUrl + "?" + qs))
```

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