Take code annotations into account

[maxjeblick]

I noticed that for code with annotations the annotations are not taken into account when creating the dependency graph.

As an example, for

def do_stuff(config: Config, model: MyModel):
    model.apply_config(config)
    return model.eval()

do_stuff is marked as being independent of Config and MyModel, as it does not call Config and MyModel class explicitly in the body.