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

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

> If add a function for unregistering a codec search function, it would be worth to add also a function for unregistering an error handler.

Registering an error handler have no refleaks when registering multiple search functions.
+1 if end user need this function.

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