Add usage stats tracking of screen time. There are two new
events, one for when the device is an interactive state, the
other for when it is non-interactive. Also add a whole new
usage stats API for retrieving aggregated data that is associated
with general events, not particular packages. In this case
it allows you to find the time the device spent interactive
and non-interactive and the count of the transitions in to
each of those states.
Bug: 74404949
Test: atest CtsUsageStatsTestCases:UsageStatsTest\#testInteractiveEvents
Change-Id: Ibe6d55e2aecb0c8519b1358644378ec5c7a4250d
ced54398cc