Add facies segmentation demo (#46)

* initial commit

* Replace README info inside jupyter notebook

* change jupyter kernel

* clear notebook cells output

* remove common requirements

* fix readme

* use openvino-extensions as pip package

* remove .cpp files and some demo fixes

* replace openvino_extensions and itk* pip requirements

* add 2d visualization before 3d

* update readme

* add some fixes

* update requirements.txt

* remove package version to install latest

* use curl instead of wget

* use os.path.join for cross-platform purposes

* add credits

* Replace openvino imports
Rewrite markdown note about GPU and NCS2

* remove itk

* Update notebooks/202-facies-segmentation/facies_demo.ipynb

Co-authored-by: Ryan Loney <[email protected]>

* change kernel

* code formatting

* add more info and remove NCS2 mention

* update README

* Add edits from Ryan

* remove itkwidgets from req.txt

* Add note about converting the model from ONNX to IR
Remove itkwidgets import from top and put it into try; except statement

* rename demo notebook

* rename demo folder