Add redis async backend

[chandr-andr]

No description provided.

[chandr-andr]

@s3rius @wbwswt Please see this pull request

[s3rius]

It doesn't follow PEP-420 and breaks structure. Please update the package.

[s3rius]

Please change structure of your project. Because now it imports errors package in taskiq/result_backends.

Please move all your code in

taskiq-redis/taskiq/result_backends/redis/

taskiq-redis
├── __init__.py
└── taskiq
    └── result_backends
        └── redis
            ├── errors
            │   ├── __init__.py
            │   └── redis_errors.py
            ├── __init__.py
            ├── redis_backend.py
            └── redis_client.py

After that you can import RedisAsyncResultBackend like this:

from taskiq.result_backends.redis import RedisAsyncResultBackend

[s3rius]

The quality is good, but I think we must update taskiq to make it easier to write new result backends.

[s3rius]

A bit more changes needed.

[s3rius]

Looks nice.