Fix IR version for decoder_model_merged_quantized.onnx (force to v8 for browser compatibility)

Fix IR version for encoder_model_quantized.onnx (force to v8 for browser compatibility)

Fix IR version for decoder_model_merged_int8.onnx (force to v8 for browser compatibility)

Fix IR version for encoder_model_int8.onnx (force to v8 for browser compatibility)

Fix IR version for decoder_model_merged_fp16.onnx (force to v8 for browser compatibility)

Fix IR version for encoder_model_fp16.onnx (force to v8 for browser compatibility)

Add ONNX: decoder_model_merged_quantized.onnx

Add ONNX: encoder_model_quantized.onnx

Add ONNX: decoder_model_merged_int8.onnx

Add ONNX: encoder_model_int8.onnx

Add ONNX: decoder_model_merged_q4.onnx

Add ONNX: encoder_model_q4.onnx

Add ONNX: decoder_model_merged_fp16.onnx

Add ONNX: encoder_model_fp16.onnx

Add ONNX: decoder_model_merged_q4f16.onnx

Add ONNX: encoder_model_q4f16.onnx