Merge "Promote frequently sharing apps as per monthly stats fetched from...

Merge "Promote frequently sharing apps as per monthly stats fetched from UsageStatsManager, in case PeopleService does not store enough sharing events when users just swicth to Sharesheet ranking in PeopleService.     Bug: 156320324 Test: atest com.android.server.people.prediction.ShareTargetPredictorTest Test: atest com.android.server.people.prediction.SharesheetModelScorerTest Test: atest com.android.server.people.data.UsageStatsQueryHelperTest" into rvc-dev am: 1de6b7ed am: 0660f710

Change-Id: Ib869b2340870233a40a2f1eb33c60719ccc5c838