Merge "Add a widget conversations category for grouping widgets in the picker" into sc-dev am: 1d8090ef61

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14129146

Change-Id: Ie897f5d27364ff3bdcc2fe7e99372f7c4e6d5e0d