Improve ExtentRanges::AddExtent() runtime from O(n) to O(log n) am: e532af3f04

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2904937

Change-Id: Ief2fe8856f452edf0315ecdd831b14685b3f5af5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>