[w3c/ServiceWorker] "uninstall" event in the worker global scope (#1511)

 I'm looking for something like an "uninstall" event in the worker global scope.

Here's my use case:

When a user clears up the site settings, it essentially removes the service worker associated with the website which in turn removes the push-subscriptions, if any for the client, from the browsers PushService. Initiating a push to that subscription, from the backend server is now useless as there wouldn't be a subscription in the first place in the PushService. Hence, storing such subscriptions on the backend server is clearly a waste of space. A possible solution would be to listen for a service worker "uninstall" event and dispatch an API call to the backend server to remove the push subscription associated with the current service worker. Hence, the need.

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https://github.com/w3c/ServiceWorker/issues/1511