Merge "[Thread] Make ThreadConfiguraiton a system API" into main am: 1dbacf6b64 am: d54f50920d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3140397

Change-Id: Id874ca5699bc3a01ecf53a936ca0f42c895b2bab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>