Create a proof-of-concept for fast cpu_bound with lazy import #4471
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This PR is a proof-of-concept for faster multiprocessing by lazily filling
sys.moduleswith dummy modules if NiceGUI is already running. It is related to and inspired by the following discussions:Note: We don't need to move run.py in a separate module as originally planned because nicegui is now cheap to import in subprocesses.
There are still import problems when running with
reload=Trueand exceptions when stopping the app with Ctrl-C.