[issue33135] Define field prefixes for the various config structs

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

In the master branch, the C function config_read_cmdline() uses:

* cmdline_warnoptions: -W command line arguments
* env_warnoptions: PYTHONWARNINGS environment variable

The config_init_warnoptions() uses these 2 list and combine it with other options, dev_mode and bytes_warnings.

The warnings options are now specified in my PEP 587:
https://www.python.org/dev/peps/pep-0587/#priority-and-rules

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