Codex App Server

## Description

1. https://x.com/thsottiaux/status/2009714843587342393
2. https://github.com/openai/codex/tree/main/codex-rs/app-server

## Environment

- **OS:** [e.g. macOS 14.1, Ubuntu 22.04, Windows 11]
- **VT Code version:** [e.g. 0.31.0 or commit hash]
- **Rust version:** [e.g. rustc 1.75.0]

## Additional Context

Add any other context about the issue or question here.