[mypyc] Loading type from imported modules.

[advait-dixit]

Fixes #1075

Previously, this compiled but failed to run:

import collections
from typing_extensions import TypedDict
class C(TypedDict):
    x: collections.deque

Although type of x was being inferred correctly, it was not looking for collections.deque in imported modules.

[hauntsaninja]

I'm not too familiar with mypyc, but this looks good, thank you!