Merge pyodide_py into python_stdlib.zip. ### Description

Merges pyodide_py.tar into python_stdlib.zip. This reduces the number of network requests during the initialization.

The original intention of splitting pyodide_py.tar from pyodide.asm.data was to give users an option to provide custom files (#2023), which is now available by modifying python_stdlib.zip directly. So I think there is no reason to have both python_stdlib.zip and pyodide_py.tar.

### Checklists

- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry
- [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)
