feat(engine): basic attribute implementation

src/Engine/Operator/Primitive.h

@@ -0,0 +1,20 @@
+#pragma once
+#include "Engine/Operator/Attribute.h"
+#include "Engine/Types.h"
+#include <variant>
+
+namespace enzo
+{
+class Primitive
+{
+public:
+    Primitive();
+    bool addIntAttrib(AttributeOwner owner, AttributeInt attribute);
+    AttributeInt findAttribByName(AttributeOwner owner, std::string name);
+private:
+    std::vector<std::variant<
+        AttributeInt,
+        AttributeFloat
+    >> pointAttribs_;
+};
+}