feat: add show_hint option to Confirm prompt

[opmr0]

Adds a show_hint builder method to Confirm that allows hiding the [y/n] hint and prompt suffix. This is useful for simple "press enter to continue" use cases where the hint is noise.

Usage:

Confirm::new()
    .with_prompt("Press enter to continue")
    .show_hint(false)
    .default(true)
    .interact()
    .unwrap();

Changes:

Added show_hint builder method to Confirm that allows hiding the [y/n] hint. Implemented via a new format_confirm_prompt_no_hint trait method with a default implementation

---

Resolves #344

[djc]

I've resolved the pre-existing CI issues, please rebase and squash your changes into a single commit.

[djc]

Thanks!

[opmr0]

Glad to contribute with you 🤍