Refactor Graphene Class based Types

[syrusakbary]

As the graphene syntax is now stable, the next focus should be internal refactor.
All class based types (ObjectType, Interface, Mutation, Union, Scalar) should have only the ClassType in common (which assure the new type have a name and a description), but each type should customize the way or the attrs the options can have.

Right now a lot of logic is repeated for handling all this cases under one, divide this logic and use when necessary.