increment with the received value (#785)

Co-authored-by: José Carlos Montañez <jc@MacBook-Pro-2.station>

core/src/commonMain/kotlin/com/xebia/functional/xef/metrics/InMemoryCounterMetric.kt

@@ -7,7 +7,7 @@ class InMemoryCounterMetric(val name: String, val logger: KLogger) : CounterMetr
   private val count = AtomicLong(0)
 
   override fun increment(n: Long) {
-    count.incrementAndGet()
+    count.addAndGet(n)
     logger.info { "Counter $name incremented to ${count.get()}" }
   }