Bug fix & Code Lint: fix RuntimeError: no running event loop

[JavieHush]

When trying to get a loop, we'll always get an error said RuntimeError: no running event loop. The code could run correctly before several commits, however, it somehow got a bug now...

The problematic code is as follows

def always_get_an_event_loop() -> asyncio.AbstractEventLoop:
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        logger.info("Creating a new event loop in main thread.")
        # loop = asyncio.new_event_loop()
        # asyncio.set_event_loop(loop)
        loop = asyncio.get_event_loop()
    return loop

to fix this bug, the code can be modified as follows

def always_get_an_event_loop() -> asyncio.AbstractEventLoop:
    try:
        loop = asyncio.get_running_loop()
    except RuntimeError:
        logger.info("Creating a new event loop in main thread.")
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
    return loop

This fix could solve issue #214
Plus, I format the code in the project using ruff-format

[wiltshirek]

The Neo4J Async lib has an issue leveraging the existing loop but it can use get_event_loop(). I tested both networKx and Neo4J with the following:

def always_get_an_event_loop() -> asyncio.AbstractEventLoop:
    try:
        **loop = asyncio.get_event_loop()**. 
    except RuntimeError:
        logger.info("Creating a new event loop in main thread.")
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
    return loop

This seems to work for both cases.    I can do a quick pull for this.  

[wiltshirek]

fixed for all use cases (NX/Neo) in: #221 . thanks for sussing this out @JavieHush