feat: export checkout_session_ext

[augustoccesar]

Description

Currently, the checkout_session_ext is not being exported, which makes the RetrieveCheckoutSessionLineItems not being able to be used.

With this change, the following should now be possible:

use std::str::FromStr;

use stripe::{CheckoutSession, CheckoutSessionId, Client, RetrieveCheckoutSessionLineItems};

#[tokio::main]
async fn main() {
    let secret_key = std::env::var("STRIPE_SECRET_KEY").expect("Missing STRIPE_SECRET_KEY in env");
    let client = Client::new(secret_key);

    let _line_items = CheckoutSession::retrieve_line_items(
        &client,
        &CheckoutSessionId::from_str("").unwrap(),
        &RetrieveCheckoutSessionLineItems::default(),
    )
    .await
    .unwrap();
}

Closes #614

Summary

Checklist

• ran cargo make fmt
• using conventional commits to hightlight user-facing fixes and features

[augustoccesar]

@arlyon with the new Rust version, Clippy started to error on:

Error:    --> src/client/stripe.rs:182:44
    |
182 |         req.insert_header("authorization", &format!("***", self.secret_key));
    |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: change this to: `format!("***", self.secret_key)`

That is why of the change on the stripe.rs. Is it fine to keep on this PR or prefer the Clippy fix on a different one?

[arlyon]

I can see CI is failing also. I am going to update MSRV and fix any outstanding lints and comment here when you can rebase :)

[arlyon]

#617 should be ready soonish

[arlyon]

Ok! Please rebase when you have the chance

[augustoccesar]

Ok! Please rebase when you have the chance

Done! ✅

[arlyon]

New release coming soon, TY 🎉

[arlyon]

🎉 This PR is included in version 0.40.0 🎉

The release is available on:

• v0.40.0
• GitHub release

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