Prepare LooperStats to be collected as a Westworld gauge matric

- call LooperStats.reset() from StatsCompanionService
- add screen_interactive to the LooperStats atom
- temporarily set uid = 1000 to avoid statsd warnings that the uid is invalid

Bug: 113651685
Test: Manual and UTs
Change-Id: Iacf45fcb746c6bb9837456a2a0c74f5a073ff822