Generics support

[Tishka17]

Let's image we have 3 classes:

class C(Generic[T]):
    pass

class Gw(Generic[T]):
    def __init__(self, c: C[T]): ...

class U:
    def __init__(self, Gw[Model]): ...

We should not declare factories for concrete intermediate classes like Gw in example. E.g. this is expected to work:

class MyProvider(Provider):
    @provide(scope=Scope.APP)
    def c_model(self) -> C[Model]: 
       return CModelImpl()

    gw = provide(Gw, scope=Scope.APP)
    u = provide(U, scope=Scope.APP)
...

container.get(U)

[Tishka17]

Fixed for concrete versions, e.g. provide(U[SomeModel])