Add BatteryTipDetector and LowBatteryTip stuffs.

This cl adds the infra of BatteryTipDetector and use LowBatteryTip
as an example(tip model + detector).

Also add SummaryTipDetector and related tests

Bug: 70570352
Test: RunSettingsRoboTests

Change-Id: Icf1349b6ede9eb7ee5ed69b39ee3a2661ac660fa

src/com/android/settings/fuelgauge/batterytip/tips/SummaryTip.java

@@ -29,6 +29,7 @@ public class SummaryTip extends BatteryTip {
     public SummaryTip(@StateType int state) {
         mShowDialog = false;
         mState = state;
+        mType = TipType.SUMMARY;
     }
 
     @Override