Add Rust-based Helm Chart Generator Tool

- Scaffold `helm-chart-tool` with Cargo project files.
- Implement core functionality: parse Cargo.toml, extract Kubernetes metadata, and generate Helm charts.
- Include support for deployments, services, ingress, and helper templates.
- Add README with detailed usage instructions.
- Update `.gitignore` for generated Helm charts and related artifacts.

helm-chart-tool/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "helm-chart-tool"
+version = "0.1.0"
+edition = "2021"
+
+[workspace]
+
+[[bin]]
+name = "helm-chart-tool"
+path = "src/main.rs"
+
+[dependencies]
+toml = "0.8"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+anyhow = "1.0"
+clap = { version = "4.0", features = ["derive"] }
+walkdir = "2.0"