Refactor OperatorImpl for backend/export

Refactor OperatorImpl for backend/export.

include/aidge/backend/cpu/operator/AddImpl_kernels.hpp

@@ -43,16 +43,16 @@ void AddImpl_cpu_forward_kernel(const std::vector<const void*> inputs_, const st
 
 // Kernels registration to implementation entry point
 REGISTRAR(AddImpl_cpu,
-    {{DataType::Any}, {DataType::Float32}},
+    {ImplSpec::IOSpec{DataType::Any}, ImplSpec::IOSpec{DataType::Float32}},
     {ProdConso::inPlaceModel, Aidge::AddImpl_cpu_forward_kernel<float, float>, nullptr});
 REGISTRAR(AddImpl_cpu,
-    {{DataType::Any}, {DataType::Float64}},
+    {ImplSpec::IOSpec{DataType::Any}, ImplSpec::IOSpec{DataType::Float64}},
     {ProdConso::inPlaceModel, Aidge::AddImpl_cpu_forward_kernel<double, double>, nullptr});
 REGISTRAR(AddImpl_cpu,
-    {{DataType::Any}, {DataType::Int32}},
+    {ImplSpec::IOSpec{DataType::Any}, ImplSpec::IOSpec{DataType::Int32}},
     {ProdConso::inPlaceModel, Aidge::AddImpl_cpu_forward_kernel<std::int32_t, std::int32_t>, nullptr});
 REGISTRAR(AddImpl_cpu,
-    {{DataType::Any}, {DataType::Int64}},
+    {ImplSpec::IOSpec{DataType::Any}, ImplSpec::IOSpec{DataType::Int64}},
     {ProdConso::inPlaceModel, Aidge::AddImpl_cpu_forward_kernel<std::int64_t, std::int64_t>, nullptr});
 }  // namespace Aidge