[w3c/ServiceWorker] Introduce Extend Service Worker Lifetime algorithm (#1010)

This replaces the steps that monkeypatched the extension of the service
worker's lifetime with an algorithm that is explicitly invoked after the
steps that dispatch the extendable events.

This also changes to use "create an event" algorithm in DOM spec.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1010

-- Commit Summary --

  * Introduce Extend Service Worker Lifetime algorithm

-- File Changes --

    M docs/index.bs (77)
    M docs/index.html (221)
    M docs/v1/index.bs (68)
    M docs/v1/index.html (185)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1010.patch
https://github.com/w3c/ServiceWorker/pull/1010.diff

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