Set qualname.

[methane]

>>> from __future__ import co_annotations
>>> def foo(a:int, b:str) -> None: pass
...
>>> f = foo.__co_annotations__
>>> f
<function foo.__co_annotations__ at 0x7f87a834c940>
>>> f.__name__
'__co_annotations__'
>>> f.__qualname__
'foo.__co_annotations__'

[larryhastings]

This looks pretty good. But I want to double-check and make sure I understand what names function objects and code objects want to be.

Also, it seems PEP 649 is on pause right now, until after Python 3.10 hits beta. I suspect it'll be a couple months before the Python Steering Committee makes a final decision on the PEP. So, I hope it's okay with you if I just leave this open and unmerged for now.

[larryhastings]

If PEP 649 is accepted, I'll act on this PR, how about that?