Add tests related to error handling.

Traditional British long count is available for systems.

Make short millia parse and stringify correctly.

Add namespace for short/long count. Also manage conversion configs and defaults.

There is only a certain string length allowed to convert parsed numbers to bigint.

Ensure exponents are normalized properly.

Address errors with gapped groups.

Make code more cleaner when parsing.

Use ESLint for formatting.

Include parse and stringify functions for American short-count locale.