add basic metrics impl

src/main/java/xyz/mcutils/backend/common/Timer.java

@@ -0,0 +1,19 @@
+package xyz.mcutils.backend.common;
+
+public class Timer {
+
+    /**
+     * Schedules a task to run after a delay.
+     *
+     * @param runnable the task to run
+     * @param delay the delay before the task runs
+     */
+    public static void scheduleRepeating(Runnable runnable, long delay, long period) {
+        new java.util.Timer().scheduleAtFixedRate(new java.util.TimerTask() {
+            @Override
+            public void run() {
+                runnable.run();
+            }
+        }, delay, period);
+    }
+}