Merge "[Search] Introduce notifyEvent api in OneSearch plugin" into sc-v2-dev am: 8727c4f78b am: a9c199c6c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16223393

Change-Id: Iee8039e78f4843962cf19e212cb0230a21f9a958