Fix support for extras in micropip. ### Description

Fix for https://github.com/pyodide/pyodide/issues/2535

### Checklists

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

# Needed for editable install
import setuptools

if __name__ == "__main__":
    setuptools.setup()

# Needed for editable install
import setuptools

if __name__ == "__main__":
    setuptools.setup()
