Merge "aconfig: move aconfig_storage_metadata proto and its apis to...

Merge "aconfig: move aconfig_storage_metadata proto and its apis to aconfig_storage_file crate" into main am: c045176c am: 16a505d5

Original change: https://android-review.googlesource.com/c/platform/build/+/2988856



Change-Id: Idaddb2775def12baaad94a0e95c2c7102794af22
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>