[w3c/ServiceWorker] Support returning ServiceWorker Client environments from `Clients.matchAll()` (#1036)

Now that we support matching uncontrolled Client environments it seems we should reasonably be able to get a Client object for a ServiceWorker.  I believe the spec mostly already supports this as it doesn't explicitly exclude ServiceWorker environments.  We just need to add a "serviceworker" enum value to ClientType.

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