Optique 0.4.0: Better help, rich docs, and Temporal support

Optique 0.4.0 introduces enhancements to streamline CLI development in TypeScript. This release focuses on improving help text organization through labeled merge groups and a new `group()` combinator, making complex CLIs more user-friendly by organizing options under clear sections. Comprehensive documentation support is added via the `run()` function, allowing brief descriptions, detailed explanations, and footers without altering parser definitions. The update also includes Temporal API support with the `@optique/temporal` package, enabling type-safe parsing for dates, times, and time zones. Improved type inference for `merge()` and `tuple()` combinators enhances type safety, alongside minor breaking changes. These updates aim to make CLI construction more intuitive and maintainable, offering developers greater control over user experience and code structure.