Initialize Cargo workspace with wraith-core, wraith, and wraith-napi crates

- Workspace root Cargo.toml with three crate members
- wraith-core: library with feature flags (tls, iroh, acme), core deps (russh, tokio, tracing, anyhow, thiserror, tokio-util), module skeleton (transport, client, server, auth, socks5, error)
- wraith: binary crate depending on wraith-core with clap derive
- wraith-napi: cdylib crate depending on wraith-core, napi, napi-derive
- .gitignore for target/ and node_modules/

crates/wraith/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "wraith"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "wraith"
+path = "src/main.rs"
+
+[dependencies]
+wraith-core = { path = "../wraith-core" }
+clap = { version = "4", features = ["derive"] }
+tokio = { version = "1", features = ["full"] }
+anyhow = "1"