[w3c/ServiceWorker] Proposal: pass custom params in ServiceWorkerRegistration for future use (#1157)

Current spec https://w3c.github.io/ServiceWorker/#navigator-service-worker-register

I want be able to pass custom parameters to ServiceWorker for future use, since localStorage and sessionStorage aren't allowed. It would be grate be able to defined version, URLs to cache, etc. early in `navigator.serviceWorker.register` like:

```
navigator.serviceWorker.register("sw.js", {
    scope: "/",
    customParamFoo: "test",
    bar: {
        version: "1.2.0",
        environment: "development"
    },
    urlsToCache: ["style.css", "icon.png"]
}
```

and after in sw.js use like:
```
self.registration.customParamFoo;
const version = self.registration.bar.version;
const urlsToCache = self.registration.urlsToCache;
```

Any early proposal for it? Any reason why not to implement this?

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https://github.com/w3c/ServiceWorker/issues/1157