Conversation naming (#8991)

Session renaming:
- `/rename my_session`
- `/rename` without arg and passing an argument in `customViewPrompt`
- AppExitInfo shows resume hint using the session name if set instead of
uuid, defaults to uuid if not set
- Names are stored in `CODEX_HOME/sessions.jsonl`

Session resuming:
- codex resume <name> lookup for `CODEX_HOME/sessions.jsonl` first entry
matching the name and resumes the session

---------

Co-authored-by: jif-oai <jif@openai.com>

codex-rs/exec/Cargo.toml

@@ -47,6 +47,7 @@ ts-rs = { workspace = true, features = [
     "serde-json-impl",
     "no-serde-warnings",
 ] }
+uuid = { workspace = true }
 
 
 [dev-dependencies]