Extract codex-auth from codex-core

Co-authored-by: Codex <noreply@openai.com>

codex-rs/auth/src/token_data_tests.rs

@@ -0,0 +1,20 @@
+use super::*;
+use pretty_assertions::assert_eq;
+
+#[test]
+fn parses_id_token_claims() {
+    let jwt = "eyJhbGciOiJub25lIn0.eyJlbWFpbCI6InVzZXJAZXhhbXBsZS5jb20iLCJodHRwczovL2FwaS5vcGVuYWkuY29tL2F1dGgiOnsiY2hhdGdwdF9wbGFuX3R5cGUiOiJwcm8iLCJjaGF0Z3B0X3VzZXJfaWQiOiJ1c2VyLTEiLCJjaGF0Z3B0X2FjY291bnRfaWQiOiJ3cy0xIn19.c2ln";
+
+    let claims = parse_chatgpt_jwt_claims(jwt).expect("jwt should parse");
+
+    assert_eq!(
+        claims,
+        IdTokenInfo {
+            email: Some("user@example.com".to_string()),
+            chatgpt_plan_type: Some(PlanType::Known(KnownPlan::Pro)),
+            chatgpt_user_id: Some("user-1".to_string()),
+            chatgpt_account_id: Some("ws-1".to_string()),
+            raw_jwt: jwt.to_string(),
+        }
+    );
+}