[w3c/push-api] Fire an event when push server connectivity changes (#194)

Do we want a way to notify sites when the connection to the push server is interrupted or resumed? Firefox Hello originally requested this as a way to show a user's presence status for IM and calls.

This would be similar to `navigator.onLine` and the `online/offline` events...though accounting for cases where the browser is online, but can't receive pushes because the server is down or blocked by a proxy.

I think this came up once before, but I can't find the issue.

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