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

Having SWs ban `[[Async]]: true` modules feels like a fine solution but I think still requires more formal ecma262 allowance. Whatever happened with Anne's [original suggestion](https://github.com/tc39/proposal-top-level-await/issues/79#issuecomment-499398393)?

I'd be happy to propose adding a [[AllowAsyncModule]] bit to agents a la the [[CanBlock]] bit `Atomics.wait`. The spirit of both are the same: different agents have different constraints around the sync-ness of computation, whether it be indefinite blocking or async modules.

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