Lenet operators

Added backend_cuda for the following operators:

• AvgPooling
• FC/Gemm
• MaxPooling
• ReLU

include/aidge/backend/cuda/operator/AvgPoolingImpl.hpp

@@ -36,7 +36,7 @@ private:
     std::shared_ptr<Tensor> mInputFallback;
 
 public:
-    AvgPoolingImpl_cuda(const AvgPooling_Op<DIM> &op) : OperatorImpl(op) {}
+    AvgPoolingImpl_cuda(const AvgPooling_Op<DIM> &op) : OperatorImpl(op, "cuda") {}
 
     static std::unique_ptr<AvgPoolingImpl_cuda> create(const AvgPooling_Op<2> &op) {
         return std::make_unique<AvgPoolingImpl_cuda>(op);