Add Battery Defender feature to Settings

 - Adding new tips of Battery Defender, will be presented once battery is overheated
 - Launch Help Center article of battery overheat when clicking Battery Defender tip
 Screenshots: https://screenshot.googleplex.com/7jUibTJANgR6UQ6.png
 	      https://screenshot.googleplex.com/tUj2LLi87SfndBN.png

Bug: 172794045
Bug: 173497281
Bug: 173496188
Test: make RunSettingsRoboTests -j40
Merged-In: Ibb106a5d42cdf6232abf9ddf4b3225bdcebccf4a
Change-Id: Id400cec248a87dd27194d93bdf035e43bbcb7f4f