Add early warning tip and detector

When battery cannot make to usual charging time, this tip would
suggest user to turn on battery saver.

This tip has two visible state(NEW, HANDLED) and display different
information.

This cl also adds an action to turn on the battery saver.

Bug: 70570352
Test: RunSettingsRoboTests
Change-Id: I0e96554df12a0d6508c27174e16d8dca7f4e1fce