Add package_type field to repodata.json. ### Description

This PR adds `package_type` field to repodata.json and use it to create a list of unvendored standard libraries. After this we don't need to manage a hard-coded list of unvendored stdlib lists in pyodide-py.

### Checklists

- [x] Add / update tests

from pathlib import Path

import typer

from ..out_of_tree import venv
from ..out_of_tree.utils import initialize_pyodide_root


def main(
    dest: Path = typer.Argument(
        ...,
        help="directory to create virtualenv at",
    ),
) -> None:
    """Create a Pyodide virtual environment"""
    initialize_pyodide_root()
    venv.create_pyodide_venv(dest)

from pathlib import Path

import typer

from ..out_of_tree import venv
from ..out_of_tree.utils import initialize_pyodide_root


def main(
    dest: Path = typer.Argument(
        ...,
        help="directory to create virtualenv at",
    ),
) -> None:
    """Create a Pyodide virtual environment"""
    initialize_pyodide_root()
    venv.create_pyodide_venv(dest)
