Remove nest_asyncio dependency

The author of nest_asyncio has passed away and the project is now abandoned: https://github.com/erdewit/nest_asyncio

Unfortunately, nest_asyncio in its current state does not support alternative event loops like uvloop, used by a number of project, e.g. the gunicorn WSGI server. According to this issue, the Python stdlib still does not have any plan on supporting nested event loop, but someone seems to have found a way to run an async function in synchronous world without an event loop at all: https://stackoverflow.com/questions/78170266/python-decorator-for-async-and-sync-function-without-code-duplication/78170267#78170267

I'll have a look tomorrow at that option and try to make a PR to remove the dependency

utils/asyn: Replace nest_asyncio with greenback

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