v0.3.0

[amirreza8002]

1. refactor the code base to reduce repeated code
2. fix async problem with django
3. add missing set and hash methods
4. change some set methods' return value
5. add utils for raw usage
6. sharded client now has get_client, but get_server is removed

TODO:

1. better type hints
2. try to fix cluster CI

MAYBE:

1. use ruff format instead of black
2. add more methods to sharded and herd client (unlikly)
3. test with redis

notes:

refactoring invloves these points:

1. moving all client operations into their own class
2. removing shared methods from other clients, and handling all of them in one method (where possible)
3. removing hardcoded (a) prifix from async code and handling that dynamically
4. turning some async methods into sync so both clients can share them
5. reuse normal sync tests for cluster (as much as possible)

async fix is as discussed in django forum

all non-deprecated set and hash methods are now added
tho hscan is not, but it can be used via scan's _type argument
i might add hscan too

the change of set method erturn values:
methods that return a collection of values now all return a set by default, but they can return a list
some of these methods alwayes returned a set, but some returned a list, which is now change