Reland "UsageStats: New event query API with specific event types."

Add a new queryEvents API to provide more flexibility
for applications to query specific types of events.

Bug: 194321117
Change-Id: I2bdeae6dffced1cc6f7a76cebe881e6c199a4582
Test: atest CtsUsageStatsTestCases:android.app.usage.cts.UsageStatsTest