Add exported ONNX model 'model_qint8_avx512.onnx'

Add exported ONNX model 'model_quint8_avx2.onnx'

Add exported ONNX model 'model_qint8_arm64.onnx'

Add exported ONNX model 'model_O4.onnx'

Add exported ONNX model 'model_O3.onnx'

Add exported ONNX model 'model_O2.onnx'

Add exported ONNX model 'model_O1.onnx'

Add new SentenceTransformer model with an onnx backend (#83)

Delete onnx/model.onnx

Upload ONNX weights exported via optimum with `library='sentence-transformers'` (#64)