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

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

Change-Id: Ibe1305c72fb507d3c15d32cc4e962f7cf6ea16cc