fix: async pagination evaluate fix for queryset object

[WellingtonNico]

Hello guys, you are doing a great job!

I found a problem using default PageNumberPagination with async endpoint returning a queryset like this:

    @route.get("/", response=list[TodoListSchema])
    @paginate(PageNumberPagination)
    async def list_todos(self, filters: TodoFilterSchema = Query()):
        todos = filters.filter(
            Todo.objects.filter(user=self.context.request.user).values("id", "title")
        )
        return todos

I was getting that error about calling sync method, so I made a small change in your PageNumberPagination and LimitOffsetPagination.
It was not a big change, I also adjusted your tests and everything is working just fine.

The reason why the error was being raised is the same as if count was called in async loop, so that change was really needed.

I don't hope you to merge my pull request, but that change is really needed and you should merge it to properly work withQuerySet object.

[WellingtonNico]

I forgot to mention that I also changed the way to configure page_size, more like a way I think we are already used to do in django. That way allows the frontend developer to make small queries in certain components for example.