[Rust] Allow resuming a session that was killed with ctrl + c (#1387)

Previously, if you ctrl+c'd a conversation, all subsequent turns would
400 because the Responses API never got a response for one of its call
ids. This ensures that if we aren't sending a call id by hand, we
generate a synthetic aborted call.

Fixes #1244 


https://github.com/user-attachments/assets/5126354f-b970-45f5-8c65-f811bca8294a

codex-rs/core/src/client_common.rs

@@ -51,6 +51,7 @@ impl Prompt {
 
 #[derive(Debug)]
 pub enum ResponseEvent {
+    Created,
     OutputItemDone(ResponseItem),
     Completed {
         response_id: String,