gh-83648: Support deprecation of options, arguments and subcommands in argparse #114086
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It is an alternative to #18208. Simpler and more complex at the same time.
On one hand, it only supports one argument: deprecated. On other hand, it supports deprecation of options (in all forms), positional arguments, and subcommands (with aliases). Warnings are localized and printed to stderr.
📚 Documentation preview 📚: https://cpython-previews--114086.org.readthedocs.build/