devel/py-project-metadata: import py-project-metadata-0.7.1

Dataclass for PEP 621 metadata with support for [core metadata]
generation

This project does not implement the parsing of `pyproject.toml`
containing PEP 621 metadata.

Instead, given a Python data structure representing PEP 621 metadata
(already parsed), it will validate this input and generate a PEP
643-compliant metadata file (e.g. `PKG-INFO`).

(wiz)