Rename Heap to CopyOnWrite

[DevYeom]

Related Issues 💭

Description 📝

• Rename to better reflect the functionality of propertyWrapper

Additional Notes 📚

// AS-IS
@Heap var value: Value

// TO-BE
@CopyOnWrite var value: Value

Checklist ✅

• If it's a new feature, have appropriate unit tests been added?
• If the changes affect existing functionality, please verify whether the above information has been appropriately described.