Make new SQLite APIs public

Bug: 289226544

Make the new SQLite APIs getTotalChangedRowsCount and
getLastChangedRowsCount public.  These APIs are useful with the new
SQLiteRawStatement class.

This change also strengthens the testStressDDLEvicts unit test.

Test: atest
 * FrameworksCoreTests:android.database
 * CtsDatabaseTestCases

Change-Id: Ia56c3430ed05bda10fb9c7212e50a3e6a94b2c46