OpenVINO Export (#6057)

* OpenVINO export

* Remove timeout

* Add 3 files

* str

* Constrain opset to 12

* Default ONNX opset to 12

* Make dir

* Make dir

* Cleanup

* Cleanup

* check_requirements(('openvino-dev',))

requirements.txt

@@ -27,6 +27,7 @@ seaborn>=0.11.0
 # scikit-learn==0.19.2  # CoreML quantization
 # tensorflow>=2.4.1  # TFLite export
 # tensorflowjs>=3.9.0  # TF.js export
+# openvino-dev  # OpenVINO export
 
 # Extras --------------------------------------
 # albumentations>=1.0.3