Document the various code generation tools used by CPython

Describe the enhancement or feature you'd like

There should be some documentation about the various code generation tools used in CPython, for example:

• freeze_modules.py
• deepfreeze.py
• generate_global_objects.py

I don't think there needs to be a massive amount of documentation about these. Just a brief mention of their purposes, how to invoke them, and notes about their related make targets.

Related are the Parser generator etc., which are already documented under Guide to CPython's Parser, but could also be mentioned. I think their existing docs could also be used as something of a template.

Describe alternatives you've considered

Argument clinic is already documented at https://docs.python.org/3/howto/clinic.html so maybe this documentation would be more appropriate in the main Python repo's docs? I'll defer to the devguide maintainers on this.

Additional context

Started from a conversation at https://github.com/python/cpython/pull/30941#issuecomment-1023501086

CC @ericisnowcurrently

审查现有的“Guide to CPython's Parser”章节以及列出的工具：freeze_modules.py、deepfreeze.py 和 generate_global_objects.py。确定文档应归入 devguide 还是 CPython 的文档，然后记录每个工具的用途、调用方式和相关的 make targets，并在适当的地方提供 parser-generator 链接。