Fixed identity to ensure identity, not assume it

src/operator/Identity.cpp

@@ -15,6 +15,9 @@
 
 void Aidge::Identity_OpImpl::forward() {
     const Identity_Op& op = dynamic_cast<const Identity_Op&>(mOp);
+    op.getOutput(0)->setBackend(op.getInput(0)->backend(), op.getInput(0)->device());
+    op.getOutput(0)->setDataType(op.getInput(0)->dataType());
+    op.getOutput(0)->setDataFormat(op.getInput(0)->dataFormat());
     op.getOutput(0)->getImpl()->copy(op.getInput(0)->getImpl()->rawPtr(), op.getInput(0)->size());
 }