Figure out possibility of tracking logger objects

[kornicameister]

Consider two examples

from loguru import logger

def a_foo(a: int) -> int:
    return a

# case 1
logger.debug('Should work because not lazy=True {}', a_foo)
# case 2
logger.opt(lazy=True).debug('Should fail, because callable {} has args', a_foo)

They key difference between these two calls is having one logger defined with lazy=True and the other without it. Loggers that are lazy will in fact try to call a function supplied as arg or kwarg but will succeed only if function has no arguments whatsoever. In the same time loggers that are not lazy will simple print out i.e. str(a_foo) of a function.

That said:

• case 1 is *not something loguru-mypy should flag
• case 2 is something loguru-mypy should flag

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