[slightlyoff/ServiceWorker] Provide a convenience method to run code outside event handler (#866)

If you want to do something like respond to a fetch event ASAP, but kick off some background work like an update check, you don't have a direct way to do that without running code outside a SW event handler (which appears to be disallowed).

I think the workaround is to post a message to a client, which then posts back, and then you do the work in the message handler. This seems unnecessarily bureaucratic and is quite a problem if there isn't actually a client available (particularly noting that there does not appear to be a client available in the "navigate" fetch request).

So why not provide something like a `self.run(promise)` method that provides a way for a SW to run more code without risking it being terminated?

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