Get marvin to import correctly when running other python processes on multiple threads

[sungchun12]

When import marvin into a streamlit app process, it kept conflicting with the main thread running the streamlit app. I worked around it by setting thread conditions within marvin to workaround this. Would love this to be a default.

# __init__.py
from importlib.metadata import version as _get_version

# load nest_asyncio
import nest_asyncio as _nest_asyncio
import asyncio as _asyncio

import threading

import asyncio as _asyncio

import threading

if threading.current_thread() == threading.main_thread():
    _nest_asyncio.apply()
else:
    _asyncio.set_event_loop(_asyncio.new_event_loop())
    _nest_asyncio.apply()