Exploring possibility to support anyio and trio

[achimnol]

Trio has a very detailed low-level APIs to instrument the event loop and tasks for fine-grained debugging.
ref) https://trio.readthedocs.io/en/stable/reference-lowlevel.html

This would open a big opportunity to implement new features like htop-like coroutine live monitor with metrics like "most/least recently yielded tasks", "active duration", etc.

The problem is that asyncio and trio has completely different instrumentation interface (asyncio.set_task_factory() and trio.lowlevel) and asyncio lacks many of detailed information available in trio.

How could we embrace both event loop frameworks?