[issue45082] ctypes: Deprecate c_buffer() alias to create_string_buffer()

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I'm +0 to this.
Since this alias is not a big maintenance burden, I think we can use deprecation period longer than minimum 2 releases.

In sdist files of the top5000 pypi packages, I found 18 packages using it including false positive (e.g. mypi just have it in pyi file).

```
$ rg -z -w c_buffer *.gz *.zip *.bz2 *.tgz
Binary file Django-3.2.6.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file Wand-0.6.7.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file av-8.0.3.tar.gz matches (found "\u{0}" byte around offset 9)
Binary file eth-hash-0.3.1.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file eth-account-0.5.5.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file eth_abi-2.1.1.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file eth-utils-1.10.0.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file grpcio-1.39.0.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file grpcio-tools-1.39.0.tar.gz matches (found "\u{0}" byte around offset 20)
Binary file hexbytes-0.2.2.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file jedi-0.18.0.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file lxml-4.6.3.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file mypy-0.910.tar.gz matches (found "\u{0}" byte around offset 11)
Binary file os_sys-2.1.4.tar.gz matches (found "\u{0}" byte around offset 13)
Binary file playsound-1.3.0.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file pyarrow-5.0.0.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file pylint-2.10.2.tar.gz matches (found "\u{0}" byte around offset 14)
Binary file pytype-2021.8.24.tar.gz matches (found "\u{0}" byte around offset 17)
```

----------
nosy: +methane

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<https://bugs.python.org/issue45082>
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