AbstractQueueIterator does not match contextlib.AbstractAsyncContextManager

[Quakumei]

Class AbstractQueueIterator, seemingly has wrong __aenter__ method's signature.

    @abstractmethod
    def __aenter__(self) -> Awaitable["AbstractQueueIterator"]:
        raise NotImplementedError

For some reason, async is missing here. Although, it should be here according to contextlib context manager:

class AbstractAsyncContextManager(abc.ABC):

    """An abstract base class for asynchronous context managers."""

    __class_getitem__ = classmethod(GenericAlias)

    async def __aenter__(self):
        """Return `self` upon entering the runtime context."""
        return self

    @abc.abstractmethod
    async def __aexit__(self, exc_type, exc_value, traceback):
        """Raise any exception triggered within the runtime context."""
        return None

    @classmethod
    def __subclasshook__(cls, C):
        if cls is AbstractAsyncContextManager:
            return _collections_abc._check_methods(C, "__aenter__",
                                                   "__aexit__")
        return NotImplemented

And is then implemented in QueueIterator,

class QueueIterator(AbstractQueueIterator):
    DEFAULT_CLOSE_TIMEOUT = 5
    # ...
    async def __aenter__(self) -> "AbstractQueueIterator":
        if not hasattr(self, "_consumer_tag"):
            await self.consume()
        return self

Not big of an issue since abstract classes are never instantiated, but still.

Python 3.9, aio-pika==9.5.4

[mosquito]

Don't you want create a PR :-)

[Quakumei]

Don't you want create a PR :-)

Here #665