Support typing.Annotated on top of typing_extensions.Annotated #8371
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This is to handle PEP 593 support recently merged into CPython[1].
I'm wondering what to do with this test-wise, as
https://github.com/python/mypy/blob/39d6bde2ec7063bd2cec42cce9295479e744bcc7/test-data/unit/check-annotated.testis full of imports fromtyping_extensionsand ideally, when running mypy tests on CPython nightly, tests would also importAnnotatedfromtyping. But maybe it's not worth it right now.[1] python/cpython#18260