Re: [w3c/ServiceWorker] Support modifying cookies on an intercepted fetch (#837)

@jakearchibald why Service Worker can't create cookies? Header `Set-Cookie` created from service worker is ignored. What is the reason behind this?

I want to create an API in service worker using [Wayne library](https://github.com/jcubic/wayne), and I can't do this properly with JWT refresh and access tokens because cookies are not supported in Service Worker.

Example code:

```javascript
self.addEventListner('fetch', (event) => {
  const url = new URL(event.request.url);
  if (url.pathname === '/api/login') {
    const headers = {
      "Set-Cookie": "TestCookie=foo; path=/; Max-Age=60;"
      "TestHeader": "foo"
    };
    cosnt res = new Response('Hello!', { headers });
    event.respondWith(new Response('Hello!', { headers }));
  }
});
```

The `Set-Cookie` header is removed by the browser, the TestHeader is present.

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