feat: sqlite 1 (#10004)

Add a `.sqlite` database to be used to store rollout metatdata (and
later logs)
This PR is phase 1:
* Add the database and the required infrastructure
* Add a backfill of the database
* Persist the newly created rollout both in files and in the DB
* When we need to get metadata or a rollout, consider the `JSONL` as the
source of truth but compare the results with the DB and show any errors

codex-rs/core/src/codex_thread.rs

@@ -12,6 +12,8 @@ use codex_protocol::protocol::SessionSource;
 use std::path::PathBuf;
 use tokio::sync::watch;
 
+use crate::state_db::StateDbHandle;
+
 #[derive(Clone, Debug)]
 pub struct ThreadConfigSnapshot {
     pub model: String,
@@ -64,6 +66,10 @@ impl CodexThread {
         self.rollout_path.clone()
     }
 
+    pub fn state_db(&self) -> Option<StateDbHandle> {
+        self.codex.state_db()
+    }
+
     pub async fn config_snapshot(&self) -> ThreadConfigSnapshot {
         self.codex.thread_config_snapshot().await
     }