Fix attributes names in cpp tests

The previous behaviour was to keep the Tensor of the removed layer. Now it is also removed

[Fix] (tmp) GraphView::forward_dims() if dimsension provided and Tensor already associated

- [Add] Attributes: __str__(), __repr__() and dict() methods
- [Add] GraphView: __repr__(), __len__() methods
- [Add] Node: __repr__() method
- [Add] Operator: __repr__() method and attr property
- improve Tensor __str__ method if it is empty
- change DataType to lower case for python

- [Add] attribute() member function of Oeprator. Return nullptr if no attributes
- [Fix] Scaling attributes names from camelCase to PascalCase

Cyril Moineau authored 9 months ago and Cyril Moineau committed 9 months ago

Extra:
- add Node::createUniqueName
- GraphView::inView with str arg

Extra:
- add Node::createUniqueName
- GraphView::inView with str arg