ESRGAN model for Candle

Provides a candle_nn::Module and weights for inference with ESRGAN using the Candle framework in Rust.

Usage

let vs = unsafe {
    candle_nn::VarBuilder::from_mmaped_safetensors(&["4x-ESRGAN.safetensors"], candle_core::DType::F32, &device)?
};

let model = esrgan::RrdbNet::try_new(vs, &RrdbNetConfig::default())?;