Function parse_callback_params 

pub fn parse_callback_params(url: &str) -> CallbackParams

Parse callback parameters from the authorization response

Example

use xjp_oidc::parse_callback_params;

let params = parse_callback_params("https://app.example.com/callback?code=abc&state=xyz");
assert_eq!(params.code, Some("abc".to_string()));
assert_eq!(params.state, Some("xyz".to_string()));