Re: [w3c/ServiceWorker] Top-level await integration for ServiceWorkers running modules (#1407)

Actually I realised the above could be accomplished with the [module blocks proposal](https://github.com/tc39/proposal-js-module-blocks), e.g. the service worker would not become active until all imports in all module blocks had also fetched. Then `import()` would only accept module blocks e.g.:

```js
// We can dynamically import module blocks only
const moduleWithTLA = module {
  // Before becoming the active service worker, this graph must successfully fetch
  // and parse
  export * from "./moduleWithTLA.js";
}

self.addEventListener("some-event", async (evt) => {
  evt.waitUntil(async () => {
    // Is a module block so allowed
    const { someExport } = await import(moduleWithTLA);
    // Is a string so not allowed
    await import("some-string");
  });
});
```

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