Add codex-network-proxy crate

codex-rs/network-proxy/src/main.rs

@@ -0,0 +1,8 @@
+use anyhow::Result;
+use clap::Parser;
+use codex_network_proxy::Args;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    codex_network_proxy::run_main(Args::parse()).await
+}