feat(packaging,types): add kzg setup to package-data

[gurukamath]

🗒️ Description

The kzg setup file needs to be specified in the *.toml file. This is important while installing eest as a library.

Required for:

• chore(packaging): make eest a publishable package #1565

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx --with=tox-uv tox -e lint,typecheck,spellcheck,markdownlint

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md. skipped
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

[danceratopz]

Great catch, @gurukamath! Thanks!