Add tron metric logging

- one tracking id for every picker type

Bug: 73952488
Test: m RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.datetime.timezone
Change-Id: Ia487f1657d6ed1f0fb40b61f39f4a47c38bd6179

tests/robotests/src/com/android/settings/datetime/timezone/BaseTimeZoneInfoPickerTest.java

@@ -119,5 +119,11 @@ public class BaseTimeZoneInfoPickerTest {
         public Context getContext() {
             return RuntimeEnvironment.application;
         }
+
+        @Override
+        public int getMetricsCategory() {
+            // the metric id doesn't matter in test
+            return 1;
+        }
     }
 }