Dataprovider iterator

Add features to dataprovider :

• Pybind iterator for dataProvider with __iter__, __next__ and __len__ implemented functions
• dataProvider shuffle argument to perform random batch permutation for learning
• dataProvider dropLast argument to drop the last non-full batch

Other :

• Add random utils to perform random batch permutation for learning
• Add support for Int8, Int16, Uint8, Uint16 for tensor python binding