[w3c/ServiceWorker] refactor ServiceWorker spec to use the Storage spec (#1606)

In order to support [partitioning service workers](https://github.com/wanderview/quota-storage-partitioning/blob/main/explainer.md#serviceworker-api) we will need to update the spec to be written in terms of the storage spec.  In particular, the service worker spec needs to use [storage keys](https://storage.spec.whatwg.org/#storage-keys) instead of origins.

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