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

The [top-level await proposal](https://github.com/tc39/proposal-top-level-await) would make module evaluation result in a Promise, rather than synchronous success or failure. This would affect the [Update](https://w3c.github.io/ServiceWorker/#update-algorithm) algorithm, which takes the steps in 16.1 if there is such a failure.

Does anyone have such concerns about this evaluation being asynchronous?

If this seems alright, then I'll make sure we have a PR for ServiceWorker after top-level await reaches Stage 3. It looks like there would be a little bit of refactoring on the SW side, so I'll wait for things to settle down editorially on the TC39 side before making more churn with dependent specs.

cc @domenic @guybedford @mylesborins

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