Generates a new Dala plugin scaffold. Usage: mix dala.plugin.new dala_camera
Creates a full plugin project structure with:
- mix.exs (with dala dependency)
- lib/ (with plugin module and component)
- native/rust/src/lib.rs (NIF entry point)
- ios/ (native bridge header)
- android/ (native bridge stub)
- test/ (test scaffold)
- README.md