chore: refactor cibuildwheel.utils

[mayeut]

This is a follow up of #1873 (comment)

I changed a bit the layout from the comment to split a bit more cibuildwheel.utils

util/cmd.py:
    call
    shell

util/file.py:
    download
    extract_zip
    extract_tar
    move_file
    chdir
    test_fail_cwd_file
    DEFAULT_CIBW_CACHE_PATH
    CIBW_CACHE_PATH
    # moved/renamed to/in resources module compared to original comment
    # resources_dir
    # install_certifi_script
    # free_thread_enable_313

selector.py: => moved to package root
    BuildSelector
    TestSelector
    selector_matches

ci.py: => moved to package root
    detect_ci_provider
    CIProvider
    fix_ansi_codes_for_github_actions

util/packaging.py:
    find_compatible_wheel
    DependencyConstraints
    get_pip_version
    combine_constraints
    # moved to venv module compared to original comment
    # find_uv => moved to venv module
    # virtualenv => moved to venv module
    # _parse_constraints_for_virtualenv => moved to venv module
    # _ensure_virtualenv => moved to venv module
    # moved to frontend module compared to original comment
    # get_build_verbosity_extra_flags
    # split_config_settings
    # BuildFrontendName
    # BuildFrontendConfig

util/helpers.py:
    format_safe
    prepare_command
    strtobool
    unwrap
    parse_key_value_string
    # moved to resources module compared to original comment
    # read_python_configs

move to __main__:
    FileReport
    Unbuffered
    print_new_wheels

move to pyodide.py:
    ensure_node

move to options.py:
    MANYLINUX_ARCHS
    MUSLLINUX_ARCHS

inline where needed:
    IS_WIN

# new modules compared to original comment
util/resources.py:
    resources_dir => PATH
    install_certifi_script => INSTALL_CERTIFI_SCRIPT
    free_thread_enable_313 => FREE_THREAD_ENABLE_313
    read_python_configs

venv.py:
    find_uv
    virtualenv
    _parse_constraints_for_virtualenv
    _ensure_virtualenv

frontend.py
    get_build_verbosity_extra_flags
    split_config_settings
    BuildFrontendName
    BuildFrontendConfig

close #1873
fix #1857

[mayeut]

qemu tests are failing because of:
xref docker/setup-qemu-action#188
xref tonistiigi/binfmt#215

test_container_removed[docker] is flaky on GHA aarch64

[joerick]

Haha I have a local branch with almost exactly the same work on it, did it on Friday morning. No matter. I actually think I like your version better, I also moved some bits to a resources module, but yours moves a few bits out of util (ci, frontend), which makes sense to me.

I think it's worth getting this in relatively quickly, to minimise merge conflict misery.

[henryiii]

Sooner rather than later sounds good to me!