Merge "Adding androidx.window.extensions:extensions" am: cf72b470d2

Original change: https://android-review.googlesource.com/c/platform/prebuilts/sdk/+/2322018

Change-Id: I262086fd49da419e932f9538c57520b2e0a3f400
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>