[w3c/ServiceWorker] Ensure the addRoutes() to be called within the install event (PR #1744)

This is a fix for https://github.com/w3c/ServiceWorker/issues/1743.

Currently, it is technically possible to call `addRoutes()` outside of the install event.  This change follows how `FetchEvent.respondWith()` deal with the case, and prevents the `addRoutes()` method to be used outside of the install event.


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1744

-- Commit Summary --

  * Ensure the addRoutes() to be called within the install event

-- File Changes --

    M docs/index.bs (28)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1744.patch
https://github.com/w3c/ServiceWorker/pull/1744.diff

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