Improved "not implemented" errors

include/aidge/operator/MetaOperator.hpp

@@ -118,7 +118,7 @@ public:
     void updateConsummerProducer() override;
     void forward() override;
     void backward() override {
-        assert(false && "not implemented");
+        AIDGE_THROW_OR_ABORT(std::runtime_error, "backward() not implemented yet for a MetaOperator");
     }
 
     inline bool isAtomic() const noexcept override final { return false; }

src/backend/OperatorImpl.cpp

@@ -129,9 +129,9 @@ void Aidge::OperatorImpl::resetConsummerProducer(){
 }
 
 void Aidge::OperatorImpl::forward() {
-    AIDGE_THROW_OR_ABORT(std::runtime_error, "forward() not implemented");
+    AIDGE_THROW_OR_ABORT(std::runtime_error, "forward() not implemented yet for operator of type {}", mOp.type());
 }
 
 void Aidge::OperatorImpl::backward() {
-    AIDGE_THROW_OR_ABORT(std::runtime_error, "backward() not implemented");
+    AIDGE_THROW_OR_ABORT(std::runtime_error, "backward() not implemented yet for operator of type {}", mOp.type());
 }