[Battery usage U] [UI] Show total "Screen On Time" in the battery usage page

Screen record: https://drive.google.com/open?id=16ZOp1E2YBzWQXbnXl786FaLFPel-S9CF&authuser=0&resourcekey=0-oRqCrdTc9FZjVgsq9orhEw&usp=drive_link
For Arabic: https://drive.google.com/open?id=1zh_4jcUnqLC6CDgwju1qQkWJ0QCtm19c&authuser=0&resourcekey=0-kuKfDdOTWxqOUmD0RfPNLQ&usp=drive_link

Next step: show screen on time for each app

Bug: 258120710
Test: manual
Change-Id: I2085a2a85ebd50b2ac876972f6a8ebbf6f20246c