Re: [w3c/ServiceWorker] Provide a way to attach data to clients (#1475)

We could add `getClientData`, but I wonder if it would encourage racing:

```js
clients.getClientData().then(data => {
  data.hello = 'world';
  clients.setClientData(data);
});
// …
clients.getClientData().then(data => {
  data.foo = 'baz';
  clients.setClientData(data);
});
```

We could ask folks to use weblocks, but if they're going to do coordination like that, they may as well just coordinate on a state object.

```js
import stateData from './state.mjs';

stateData.hello = 'world';
clients.setClientData(stateData);
// …
stateData.foo = 'baz';
clients.setClientData(stateData);
```

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