Move constructor, and clone functions from operators' header to src and add src file for PaddedConv and PaddedConvDepthWise

Move constructor, and clone functions from operators' header to src and add src file for PaddedConv and PaddedConvDepthWise

Christophe Guillon authored 9 months ago and Maxence Naud committed 9 months ago

Activate previously commented tests on scalars for
elementwise operators: Test_[Div|Mul|Sub|Pow]_Op.cpp.
Add scalar test for Test_MatMul_Op.cpp.
Add negative scalar tests for Test_[Concat|Transpose]Impl.cpp.
Update implementations forward/forwardDims of operators
Concat|Transpose|MatMul to assert on unexpected scalar inputs.

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

- Change Softmax_Op 'axis' attributes from int to size_t
- Change Transpose_OpImpl to TransposeImpl
- Change snake-case to camel-case names
- fix tests according to AvgPooling_Op changes

- Change Softmax_Op 'axis' attributes from int to size_t
- Change Transpose_OpImpl to TransposeImpl
- Change snake-case to camel-case names
- fix tests according to AvgPooling_Op changes