Machine-readable specification for deprecated and removed CPython APIs

[corona10]

See the details from https://discuss.python.org/t/machine-readable-specification-for-deprecated-and-removed-apis-of-cpython/92039

What we need

Working prototype:

• Read in TOML
• Process data as needed (basic fields)
• Add directive to output deprecation in docs
• Output JSON

Initial implementation

• Formalize JSON output
• Validation for input schema (JSONschema?)
• Process remaining data processing
• Generate admonition messages from the individual keys

cc @CAM-Gerlach

[corona10]

@CAM-Gerlach I leave the sections on what we have to do, so please feel free to update the issue.

[corona10]

@CAM-Gerlach So where your PoC is working on?