Country name normalization library

Usage example

```rust let cn = CountryNameNormalizer::new("./countries/en.toml").unwrap(); let stkittisnevis = cn.normalize_country("St. Kitts & Nevis").unwrap();

println!("{:?}", stkittisnevis)

// // Country { // aliases: Some(["Federation of Saint Christopher and Nevi"]), // alpha2: "KN", // alpha3: "KNA", // fifa: "SKN", // ioc: "SKN", // iso_name: "Saint Kitts And Nevis", // numeric: 659, // official: "Federation of Saint Kitts and Nevis", // short: "Saint Kitts And Nevis", // emoji: "🇰🇳", // shortcode: ":flag-kn:", // } ```