@metric_scope makes wrong assumption to detect async event loop

[myagent-git]

@metric_scope is making a wrong assumption that a sync function cannot be called in an async event loop. If the decorated function is a regular sync function, then @metric_scope incorrectly assumes that it is not in an event loop and can use asyncio.run. This assumption is obviously wrong.

To reproduce the issue:

#!/usr/bin/env python3

import asyncio

from aws_embedded_metrics import metric_scope

@metric_scope
def foo(metrics):
    print("Some businesss logic")
    metrics.put_metric("foo", 1, "Count")

async def main():
    foo()

if __name__ == "__main__":
    asyncio.run(main())

Error stack trace:

......
    foo()
  File "~/.local/share/mise/installs/python/3.12.10/lib/python3.12/site-packages/aws_embedded_metrics/metric_scope/__init__.py", line 88, in wrapper
    asyncio.run(logger.flush())
  File "~/.local/share/mise/installs/python/3.12.10/lib/python3.12/asyncio/runners.py", line 191, in run
    raise RuntimeError(
RuntimeError: asyncio.run() cannot be called from a running event loop
sys:1: RuntimeWarning: coroutine 'MetricsLogger.flush' was never awaited