[Automated] Update base model metadata

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Rename onnx/encoder_model_quantized.onnx to onnx/encoder_model_q4.onnx

Rename onnx/decoder_model_merged_quantized.onnx to onnx/decoder_model_merged_q4.onnx

Rename onnx/decoder_with_past_model_quantized.onnx to onnx/decoder_with_past_model_q4.onnx

Rename onnx/decoder_model_quantized.onnx to onnx/decoder_model_q4.onnx

Update README.md

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