Parakeet TDT 0.6B v3

The optional speech-recognition model downloaded by Silent Films is an INT8 ONNX
conversion of NVIDIA Parakeet TDT 0.6B v3 for sherpa-onnx.

Original model: https://huggingface.co/nvidia/parakeet-tdt-0.6b-v3
ONNX conversion: https://huggingface.co/csukuangfj/sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8
Original model license: Creative Commons Attribution 4.0 International (CC BY 4.0)
