Add a table constant view utility for ItemArray

src/mesh/ItemArray.hpp

@@ -43,6 +43,13 @@ class ItemArray
   friend ItemArray<std::remove_const_t<DataType>, item_type, ConnectivityWeakPtr>;
 
  public:
+  // This is not the correct way to look at ItemArray, use with care
+  Table<const DataType>
+  tableView() const
+  {
+    return m_values;
+  }
+
   [[nodiscard]] friend PUGS_INLINE ItemArray<std::remove_const_t<DataType>, item_type, ConnectivityPtr>
   copy(const ItemArray<DataType, item_type, ConnectivityPtr>& source)
   {