chore: Refactor async pagination

[Amr-elwetaidy]

Async Paginator

The evaluate AsyncGenerator causes:

django.core.exceptions.SynchronousOnlyOperation: You cannot call this from an async context - use a thread or sync_to_async

This part of the code is the reason:

In fact, it's unnecessary at all as django already handles the queryset and evaluates it as an AsyncGenerator once you call it with async for

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Similarly with the count() and acount() methods, you can directly call them on the queryset and no need to call all() first.

[vitalik]

I think .all there used to foce method that does not exist in a list

[Amr-elwetaidy]

I think .all there used to foce method that does not exist in a list

I missed that one, but still why not use if not isinstance(queryset, list): ...

[Amr-elwetaidy]

Anyway, The important one is the async, I had to override the class to get it working.