[issue32192] Provide importlib.util.lazy_import helper function

[Nick Coghlan]

Change by Nick Coghlan <ncoghlan at gmail.com>:


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nosy: +brett.cannon, eric.snow
stage:  -> needs patch
type:  -> enhancement
versions: +Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32192>
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