fix: fastapi lifespan management with multiple apps at once #241
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When streamsync is run by a FastAPI application as a subapplication, its kernel does not start. FastAPI ignores the lifespan associated with a sub-application. It fix #213 & #186.
The documentation Multiple apps at once is currently broken.
This PR provides a helper
streamsync.serve.lifespan
for the FastAPI application that scans apps mounted in FastAPI and identifies which are streamsync instances. The kernel of each application is started.