Merge "aconfig: add aconfig_storage_metadata proto" into main am: dfb817c2

Original change: https://android-review.googlesource.com/c/platform/build/+/2928251



Change-Id: Id6173a23a30990e740c4a99bf12965d630dcdee4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>