Merge "[OneSearch] Add a clear function in the plugin to clear cache and memory." into sc-v2-dev am: 3118d24449 am: 7450cf9740

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15749048

Change-Id: Ifbf4951eb770b4b838fb35fc522ca2d2528795d9