`_functools.KeyWrapper` is exposed after convertion to a new module type

[sobolevn]

After #23405 we now have KeyWrapper exposed.
I suspect that it is an internal helper and should not be importable:

Python 3.12.0a0 (heads/main:0d04b8d9e1, Sep 7 2022, 13:20:36) [Clang 11.0.0 (clang-1100.0.33.16)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from _functools import KeyWrapper
>>> help(KeyWrapper)
Help on class KeyWrapper in module functools:

class KeyWrapper(builtins.object)
 | Methods defined here:
 |
 | __call__(self, /, *args, **kwargs)
 | Call self as a function.
 |
 | __eq__(self, value, /)
 | Return self==value.
 |
 | __ge__(self, value, /)
 | Return self>=value.
 |
 | __getattribute__(self, name, /)
 | Return getattr(self, name).
 |
 | __gt__(self, value, /)
 | Return self>value.
 |
 | __le__(self, value, /)
 | Return self<=value.
 |
 | __lt__(self, value, /)
 | Return self<value.

Related #26416
Found while working on #96640
CC @shihai1991

I will send a PR shortly.

[corona10]

I double-checked with the old python version

Python 3.8.13 (default, Sep 7 2022, 20:07:00)
[Clang 13.1.6 (clang-1316.0.21.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import _functools
>>> dir(_functools)
['__doc__', '__loader__', '__name__', '__package__', '__spec__', '_lru_cache_wrapper', 'cmp_to_key', 'partial', 'reduce']
>>>

Now we can close the issue