[w3c/ServiceWorker] Missing task queuing (#1403)

In https://w3c.github.io/ServiceWorker/#run-service-worker-algorithm , step 4.13 says

> If callbackSteps is provided, run them with evaluationStatus on the original thread that invoked this algorithm, while continuing in parallel with these steps.

That's not really something that can work. Anne suggests queuing a task instead.

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