[issue43817] Add typing.get_annotations()

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

Should this feature implemented in typing module? How about inspect module?

Additionally, how about adding `get_annotation_str()`, which returns str always?
Some use cases (e.g. `help(f)`) need just string. I want to skip eval() in it.

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nosy: +methane

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