Set default values for screen dim feature

Waking the screen up again just as it is dimming causes the
screen to stay awake for 10 minutes. Set this as default off
to avoid this behaviour and reduce the default to 5 minutes.

This also adds overlayable resources that allow the
configuration of the other screen dim feature parameters
and updates the name of the feature from 'keep screen on'
to 'prevent screen timeout', as keep screen on is overloaded
with usages elsewhere in the framework.

Flag: NA
Bug: 240447628
Test: atest ScreenUndimDetectorTest
Change-Id: Iaaa2e0ffa17997088d50a40e17948785d4a648df