[issue39036] Add center_char attribute to str type

[Lovi]

Lovi <1668151593 at qq.com> added the comment:

Sorry, I made a mistake.

The center char of '12345' is '3' and the center char of 'abcd' is '' because it doesn't have the most central character.

In my opinion, with center_char, when you need the center character of a string you can get it directly with str.center_char instead of tedious index and calculation.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39036>
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