Ensure host server waits with forwarding requests to worker #2754
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This PR moves the state of the host server into the
AppContextclass. (I say "state" but it's just the worker and whether the backend is ready.) This makes it easier to control access to the worker. I made the worker a private field and give it out via 2 methods:get_workerandget_worker_unmanaged. The difference between these two is thatget_workerwill wait until the backend is fully ready, whileget_worker_unmanagedwill not. So code that wants to use the worker has to declare whether it wants a ready worker or a worker in any state.This fixes the loading issue we talked about here.