list files and directories in the current directory or the requested directory
```cargo
serde = "1.0.140"
anyhow = "1.0.58"
tokio = { version = "1", features = ["full"] }
color-eyre = "0.6.2"
tracing = "0.1.35"
tracing-subscriber = "0.3.15"
chrono = "0.4"
derive_builder = "0.12.0"
```