Use scheduled executor within token cache

Co-Authored-By: Paul Horn <paul.horn@neotechnology.com>

Author: s1ck

core/src/main/java/org/neo4j/gds/core/concurrency/ExecutorServiceUtil.java

@@ -29,6 +29,7 @@
 import java.util.concurrent.ForkJoinPool;
 import java.util.concurrent.FutureTask;
 import java.util.concurrent.RejectedExecutionHandler;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
@@ -49,6 +50,10 @@ public static ExecutorService createSingleThreadPool(String threadPrefix) {
         return Executors.newSingleThreadExecutor(NamedThreadFactory.daemon(threadPrefix));
     }
 
+    public static ScheduledExecutorService createSingleThreadScheduler(String threadPrefix) {
+        return Executors.newSingleThreadScheduledExecutor(NamedThreadFactory.daemon(threadPrefix));
+    }
+
     static ExecutorService createThreadPool(int corePoolSize, int maxPoolSize) {
         return createThreadPool(THREAD_NAME_PREFIX, corePoolSize, maxPoolSize);
     }