[w3c/ServiceWorker] ServiceWorkerContainer: Web Workers and Service Workers (#1552)

Hi!

I am doing some exploration into Web Workers and Service Workers and the communication mechanism between them.

I was expecting inside `DedicatedWorkerGlobalScope` -> `WorkerNavigator` there to be the `seviceWorker` property for the `ServiceWorkerContainer`.

```js
// Inside web-worker.js
async function postMessageToServiceWorker() {
    const reg = await self.navigator.serviceWorker.getRegistration(); // <-- throws exception, 'serviceWorker' undefined
    reg.active.postMessage({ some: 'message' });
}
```

According to [the spec](https://w3c.github.io/ServiceWorker/#serviceworkercontainer), I think this is supposed to be populated? But I haven't found a clear answer one way or another.

![image](https://user-images.githubusercontent.com/7726025/98025654-d76a6d00-1dbe-11eb-8c51-ebef8ddfdf5c.png)

Is this just a browser compatibility bug? Is there a clear answer to whether or not the `ServiceWorkerContainer` is supposed to be available in Web Workers?

I tried testing in Chromium Edge, Chrome, and Firefox latest.

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