feat(engine): basic attribute implementation

src/Engine/Operator/Attribute.h

@@ -0,0 +1,50 @@
+#pragma once
+#include <string>
+#include <optional>
+#include <vector>
+#include "Engine/Types.h"
+#include <memory>
+
+
+namespace enzo{
+    namespace ga{
+
+        template <typename T>
+        class AttributeHandle;
+
+        class Attribute
+        {
+        public:
+            Attribute(std::string name, ga::AttributeType type);
+            AttributeType getType();
+
+
+
+            template <typename T>
+            friend class AttributeHandle;
+
+        private:
+            // private attributes are attributes that are hidden from the user
+            // for internal use
+            bool private_=false;
+            // hidden attributes are user accessible attributes that the user may
+            // or may want to use
+            bool hidden_=false;
+            // allows the user to read the attribute but not modify it
+            bool readOnly_=false;
+
+            ga::AttributeType type_;
+
+            std::string name_;
+
+            void* data_;
+
+
+            // data stores
+            std::shared_ptr<std::vector<int>> intStore_;
+            std::shared_ptr<std::vector<float>> floatStore_;
+        };
+
+
+    }
+}