fixed atomic counter to be seq_cst and added compile time checking of T to be integral

utils/counters/atomic_counter.hpp

@@ -2,16 +2,23 @@
 #define MEMGRAPH_UTILS_COUNTERS_ATOMIC_COUNTER_HPP
 
 #include <atomic>
+#include <type_traits>
 
-template <class T>
+template <class T,
+          typename std::enable_if<std::is_integral<T>::value>::type* = nullptr>
 class AtomicCounter
 {
 public:
-    AtomicCounter(T initial) : counter(initial) {}
+    AtomicCounter(T initial = 0) : counter(initial) {}
 
-    T next()
+    T next(std::memory_order order = std::memory_order_seq_cst)
     {
-        return counter.fetch_add(1);
+        return counter.fetch_add(1, order);
+    }
+
+    T operator++()
+    {
+        return next();
     }
 
 private: