Update framework from jetpack.

Changes included:
*cb7ab07: Create a hidden class FeatureConstants
*599ab03: Adding a delete propagation boolean to StringPropertyConfig
*2b3f366: Delete deprecated class AppSearchObserverCallback.
*48a6dff: Add @CanIgnoreReturnValue annotation to appsearch code.
*6a7cc4e: Adjust exportToFramework tags for SearchSpec and Features.java.
*2a9ed18: Add simple feature checking in AppSearch.
*e921a1c: Minor refactors to AppSearch code.

Bug: 268521214
Bug: 256022027
Bug: 232959004
Bug: 232805516
Bug: 232959004
Test: presubmit
Change-Id: I727fd4458a86720632ffea616dfa145fa6179a9f