Add Starlette lifespan handler implementation #683
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Starlette recently added cool new feature called lifespan in v0.26.0 and FastAPI followed the suit in v0.93.0. This makes it possible to get rid of good chunk of initialization spaghetti in starlette-based apps (making container a single entry point in the application), + reduces amount of the pain in the ass scheduling background tasks in the event loop of the ASGI app.