Add forceSetSchema and fix the setSchema API comment.

Bug: 145635424
Test: atest CtsAppSearchTestCases FrameworksCoreTests:android.app.appsearch FrameworksServicesTests:com.android.server.appsearch.impl
Change-Id: Ibf7f7f33226115a94efbc659c1366edd3ccb4a3c
5 files changed