speed up HiFiGAN !!

• Paper: iSTFTNet : Fast and Lightweight Mel-spectrogram Vocoder Incorporating Inverse Short-time Fourier Transform

• Code: https://github.com/rishikksh20/iSTFTNet-pytorch

Please compare with original HiFiGAN to get the diff: https://github.com/jik876/hifi-gan

After this work, you can also modify VITS to VITS_iSTFT