feat: Referer Header add structured URI parsing and RFC-compliant validation

[ferrohd]

Gave some love to the Referer header while respecting RFC7231 spec.

Usage

let referer = Referer::from_str("https://example.com:8443/api/users?page=1").unwrap();
assert_eq!(referer.scheme(), Some("https"));
assert_eq!(referer.hostname(), Some("example.com"));
assert_eq!(referer.path(), "/api/users");
assert_eq!(referer.query(), Some("page=1"));