gh-91513: add taskname to logging.LogRecord attributes

[carlbordum]

No description provided.

[Akuli]

• If asyncio hasn't been imported, aio is None and this will fail with AttributeError.
• If we aren't running any asyncio task right now, current_task() will raise RuntimeError.

In other words, this fails with or without the asyncio import:

#import asyncio
import logging
logging.error("blah blah")

I think we should also make sure that self.taskname is always set to something, and just set it to None if logAsyncTasks is set to False or no asyncio task is running. See how it sets self.processName = None above.

[vsajip]

This PR needs tests (which would have exposed the point that @Akuli makes) and it would also make sense to use taskName in preference to taskname. I know it's not PEP-8 compliant and all, but logging predated PEP-8 and it makes more sense to keep things consistent at a local level.

It would make sense to do something like:

if not logAsyncioTasks:
    self.taskName = None
else:
    aio = sys.modules.get('asyncio')
    if aio is None:
        self.taskName = None
    else:
        self.taskName = aio.current_task().get_name()

or, more concisely,

self.taskName = None
if logAsyncioTasks:
    aio = sys.modules.get('asyncio')
    if aio:
        self.taskName = aio.current_task().get_name() 

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