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/message_history.rs

@@ -23,7 +23,6 @@ use std::path::PathBuf;
 use serde::Deserialize;
 use serde::Serialize;
 
-use codex_protocol::mcp_protocol::ConversationId;
 use std::time::Duration;
 use tokio::fs;
 use tokio::io::AsyncReadExt;
@@ -31,6 +30,7 @@ use tokio::io::AsyncReadExt;
 use crate::config::Config;
 use crate::config_types::HistoryPersistence;
 
+use codex_protocol::mcp_protocol::ConversationId;
 #[cfg(unix)]
 use std::os::unix::fs::OpenOptionsExt;
 #[cfg(unix)]