stats: add global way to check if API is enabled

src/counters.c

@@ -116,6 +116,11 @@ static int stats_loggers_active = 1;
 
 static uint16_t counters_global_id = 0;
 
+bool StatsEnabled(void)
+{
+    return (stats_enabled == TRUE);
+}
+
 static void StatsPublicThreadContextInit(StatsPublicThreadContext *t)
 {
     SCMutexInit(&t->m, NULL);

src/counters.h

@@ -109,6 +109,7 @@ void StatsSetupPostConfigPreOutput(void);
 void StatsSetupPostConfigPostOutput(void);
 void StatsSpawnThreads(void);
 void StatsRegisterTests(void);
+bool StatsEnabled(void);
 
 /* functions used to free the resources alloted by the Stats API */
 void StatsReleaseResources(void);