Add aclose method for Redis asyncio version

[patrick91]

See original source code: https://github.com/redis/redis-py/blob/fd0b0d3eec48daa07ca37e06862e3461c8373a60/redis/asyncio/client.py#L578-L594

close is deprecated, shall we mark it as deprecated using @deprecated? 😊

[patrick91]

There's quite a few failure now, after upgrading, I'm happy to fix them if you're ok with this PR :D

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

prefect (https://github.com/PrefectHQ/prefect)
- src/prefect/blocks/redis.py:114: error: "Redis[bytes]" has no attribute "aclose"; maybe "close"?  [attr-defined]

[srittau]

Thanks for your contribution!

Since redis ships a py.typed file starting with redis 5, types-redis deliberately doesn't support redis 5 and is slated to be removed: #10592. When using redis 5, I suggest to remove types-redis and report any type problems directly to redis-py, so they can be fixed. (And I'm sure they are happy about PRs as well.)