Re: [ServiceWorker] Expose ServiceWorkerContainer to Worker; Define service worker client as an environment settings object; Adding registration as a global; Moving .update() onto the registration object (ed665ba)

Summary of the changes (https://github.com/slightlyoff/ServiceWorker/pull/562 has been merged):
- Expose `ServiceWorkerContainer` to Worker (`WorkerNavigator.serviceWorker`)
- Define _service worker client_ in terms of an _environment settings object_
- Add `ServiceWorkerRegistration` object to `ServiceWorkerGlobalScope`
  - Meaning `.scope` is removed from `ServiceWorkerGlobalScope`
- Move `.update()` from `ServiceWorkerGlobalScope` to `ServiceWorkerRegistration`

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