Co-authored-by: Sebastian Hernandez <sebastian@rhinoafrica.com>

* Add black to dev-env requirements

* Apply black to everything

DjangoObjectType.get_node calls get_queryset so this approach offers
support for more cases and works with DjangoFilterConnectionField.

Newer versions of django-graphene have resolver functions with the
model class as the first argument. Make QueryOptimizer._get_name_from_resolver()
more robust by looking for the first function argument that is either
a string or another partial function.