Add some tips to use OTB python interfaces with rasterio and numpy

Yannick TANGUYrequested to merge
improve_Python_doc_numpy_rasterio into develop

Add some example in OTB CookBook to help use Python interfaces with rasterio and numpy. From my point of view, this page could still be improved. Thank you for your feedback !

Edited by Yannick TANGUY

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