Export default setup/cleanup commands at base module level

[jenstroeger]

Hi, my feature request is related to merged PR #119. Basically I’m asking if you’d be ok to export more names at the main module level in __init__.py, for example:

__all__ = [
    ...
    "get_setup_command",
    "get_cleanup_command",
]

to gain access to the plugin’s default commands.

For context: these come in handy for setups like

@pytest.fixture(scope="session")
def docker_setup() -> str | list[str]:
    if os.getenv("GITHUB_ACTIONS") == "true":
        return []
    return pytest_docker.plugin.get_setup_command()  # return pytest_docker.get_setup_command()

so that I don’t need to reach into the plugin module. (See also #80.)

I can provide a PR again.