[Automated] Update base model metadata

Update README.md

Rename onnx/model.onnx_data to onnx/decoder_model_merged.onnx_data

Rename onnx/model.onnx to onnx/decoder_model_merged.onnx

Rename onnx/model_quantized.onnx to onnx/decoder_model_merged_quantized.onnx

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