Generate more typescript types and return conversation id with ConversationSummary (#3219)

This PR does multiple things that are necessary for conversation resume
to work from the extension. I wanted to make sure everything worked so
these changes wound up in one PR:
1. Generate more ts types
2. Resume rollout history files rather than create a new one every time
it is resumed so you don't see a duplicate conversation in history for
every resume. Chatted with @aibrahim-oai to verify this
3. Return conversation_id in conversation summaries
4. [Cleanup] Use serde and strong types for a lot of the rollout file
parsing

codex-rs/core/src/rollout/mod.rs

@@ -7,6 +7,8 @@ pub(crate) mod policy;
 pub mod recorder;
 
 pub use recorder::RolloutRecorder;
+pub use recorder::RolloutRecorderParams;
+pub use recorder::SessionMeta;
 pub use recorder::SessionStateSnapshot;
 
 #[cfg(test)]