Merge "snapshotctl: Create and write pre-created snapshots" into main am: 51e3b9cbca

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2739093

Change-Id: Ibcbdd6add41873d40c913f6ef8b73f59211de914
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>