[issue46480] Implement typing.assert_type

[Shantanu]

Change by Shantanu <hauntsaninja at gmail.com>:


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nosy: +hauntsaninja
nosy_count: 5.0 -> 6.0
pull_requests: +30158
pull_request: https://github.com/python/cpython/pull/32069

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46480>
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