fix: add suggestions to the TOML error message

[henryiii]

Touches up the config errors, including Python 3.10 style suggestions if a name is close to an existing name. This includes - and _ confusion.

Closes #761.

[henryiii]

Example:

Traceback (most recent call last):
  File "/Users/henryschreiner/git/software/cibuildwheel/.venv/bin/cibuildwheel", line 33, in <module>
    sys.exit(load_entry_point('cibuildwheel', 'console_scripts', 'cibuildwheel')())
  File "/Users/henryschreiner/git/software/cibuildwheel/cibuildwheel/__main__.py", line 129, in main
    build_in_directory(args)
  File "/Users/henryschreiner/git/software/cibuildwheel/cibuildwheel/__main__.py", line 189, in build_in_directory
    options = compute_options(platform=platform, command_line_arguments=args)
  File "/Users/henryschreiner/git/software/cibuildwheel/cibuildwheel/options.py", line 592, in compute_options
    options = Options(platform=platform, command_line_arguments=command_line_arguments)
  File "/Users/henryschreiner/git/software/cibuildwheel/cibuildwheel/options.py", line 345, in __init__
    self.reader = OptionsReader(
  File "/Users/henryschreiner/git/software/cibuildwheel/cibuildwheel/options.py", line 192, in __init__
    self._validate_global_option(option_name)
  File "/Users/henryschreiner/git/software/cibuildwheel/cibuildwheel/options.py", line 232, in _validate_global_option
    raise ConfigOptionError(msg)
cibuildwheel.options.ConfigOptionError: "Option 'test_command' not supported in a config file. Perhaps you meant 'test-command'?"

Technically, known mistakes in a command line app should only print messages, not tracebacks. But this is a step in the right direction.

[joerick]

Brilliant, thanks @henryiii !