feat: improve output of exec subcommand (#719)

codex-rs/exec/Cargo.toml

@@ -13,8 +13,11 @@ path = "src/lib.rs"
 
 [dependencies]
 anyhow = "1"
+chrono = "0.4.40"
 clap = { version = "4", features = ["derive"] }
 codex-core = { path = "../core", features = ["cli"] }
+owo-colors = "4.2.0"
+shlex = "1.3.0"
 tokio = { version = "1", features = [
     "io-std",
     "macros",
@@ -24,4 +27,3 @@ tokio = { version = "1", features = [
 ] }
 tracing = { version = "0.1.41", features = ["log"] }
 tracing-subscriber = { version = "0.3.19", features = ["env-filter"] }
-owo-colors = "4.2.0"