Updates required for QAT

This MR includes:

• Abs operator;
• Hook system for Node (as suggested in #98 (closed) @thibaultallenet).
• Update of SinglePassGraphMatching to match no connection (with the special node keyword $).
• Solved some SinglePassGraphMatching issues and added more complex unit tests.
• Added missing inChannels() method for FC operator;
• Added matchFrom() method to SinglePassGraphMatching in order to match a query only for a specific starting node;
• Fix issue #87 (closed).

include/aidge/utils/StaticAttributes.hpp

@@ -160,7 +160,7 @@ public:
         if (i == SIZE-1) {
             // Workaround for NVCC from 12.2.1 to 12.4.1
             // error: no suitable constructor exists to convert from "const char *" to "std::type_info"
-            typename std::tuple_element<SIZE-1,std::tuple<T...>>::type dummy;
+            typename std::tuple_element<SIZE-1,std::tuple<T...>>::type dummy{};
             return typeid(dummy);
             //return typeid(typename std::tuple_element<SIZE-1,std::tuple<T...>>::type);
         }