Move the logic of batteryMeterDrawable to settingslib

In Settings, we also need a BatteryMeterDrawable to show battery meter,
that's why I move it to settingslib.

In this cl, what I have changed is listed below:
1. Create BatteryMeterDrawableLib that contains logic of battery
drawing.
2. Still Keep the battery control logic in systemui.
3. Remove hardcoded battery color by using the color state lists.
4. Move some tests to settingslib

Bug: 34771849
Test: make SettingsLibTests

Change-Id: I39c0f0e31ca5e1b958467298db1d0590d16c9f6d