[issue41842] Add codecs.unregister() to unregister a codec search function

[hai shi]

Change by hai shi <shihai1991 at 126.com>:


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keywords: +patch
nosy: +shihai1991
nosy_count: 3.0 -> 4.0
pull_requests: +21424
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22360

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41842>
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