Add androidx.test variants of util libraries.

See go/jetpack-test-android-migration

Test: m cts
Bug: 127482512
Change-Id: If88bf99864ddaa769c754b6e910e4bb45a9fbb3b
Merged-In: Iaff9af3c774c7f4867cc1861dcf96d7b5c5e8ff4
85 files changed