[w3c/ServiceWorker] Consider exposing Page Lifecycle state to service-worker (#1345)

[Page lifecycle](https://wicg.github.io/page-lifecycle/spec.html) state could be exposed on WindowClient (similar to visibilityState): in particular Frozen and Discarded states.
We need concrete use-cases for these: please comment here, if you have any.

One possible case is (new API for) updating tab title from service worker (eg. inbox count in gmail).
While currently such sites needing updating of title / playing a sound (chat notification) etc don't get frozen, in the future there could be an API to support this via service worker. Such an API may need to know page lifecycle state.


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https://github.com/w3c/ServiceWorker/issues/1345