Catch exceptions in UsageStatsService on bad data.

Instead of throwing exceptions from UsageStatsService and potentially
crashing the system server, catch exception on reading/writing bad data
and log the exception.

Also ensure proper handling of deobfuscating bad data.

Bug: 140459061
Bug: 135484470
Test: atest IntervalStatsTests
Test: atest UsageStatsDatabaseTest
Change-Id: I17d6ad5e377a2636ff42c9b422fe6ddf1201fc08