Revert "Revert "Expose extent_ranges for libsnapshot to use in resolving..."" am: c1c9305479 am: 2d884d50e4

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1412367

Change-Id: Id3218d26fdf1314363e4551d331ec8e306677f82