Write UsageEvents Parcel data as a Blob

If too many events are queried from UsageStats, the Parcel will be too
big for a transaction. If the data is written as a Blob, the Parcel will
store too large data in ashmem.

Test: atest android.app.usage.cts.UsageStatsTest
Test: manual (create 1MB in UsageEvents and queryEvents)
Bug: 79860717
Change-Id: Ieb4bd486c83a9cc11fdff55e8fa457a9bdca7395