[issue43817] Add inspect.get_annotations()

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

> And since there are definitely circumstances in which it can't return __annotations__ directly, that indicates that it should never return __annotations__ directly.

And the follow on here is that get_annotations() shouldn't set __annotations__ if it's None. I realize I'm just stating the obvious.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43817>
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