Support typing.ForwardRef declarations

[koliyo]

Steps to reproduce

Current behavior

With this code

from typing import ForwardRef

Foo = ForwardRef('Foo')

class Foo:
    pass

I get

foo.py:5:0: E0102: class already defined line 3 (function-redefined)

Expected behavior

I would expect pylint to support this construction

pylint --version output

$ python3 -m pylint --version
__main__.py 2.1.1
astroid 2.0.4
Python 3.7.0 (default, Jul 23 2018, 20:22:55)
[Clang 9.1.0 (clang-902.0.39.2)]

[PCManticore]

Thanks for creating an issue! This definitely makes sense.

[NeilGirdhar]

Similarly,

from typing import Callable, Any
f: Callable[[], Any]
def f():
    pass

Gives E0102: function already defined line 2 (function-redefined)