copy-dynlibs feature like ORT crate?

The ORT crate used by rustnn provides a feature to symlik/copy the ORT library next to the rust binaries to directly dynamically load them (especially on Windows). https://github.com/pykeio/ort/blob/main/Cargo.toml#L45

The feature is not used by rustnn

This might be a nice-to-have in future. It's not really necessary
