Adapt to the latest version of PWmat output file

[lhycms]

Summary

Major changes:

• Adapt to the latest version of PWmat output files, while also being compatible with older versions of output files。

Checklist

• Google format doc strings added. Check with ruff.
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

Tip: Install pre-commit hooks to auto-check types and linting before every commit:

pip install -U pre-commit
pre-commit install

[janosh]

thanks @lhycms! 👍