Improve ExtentRanges::AddExtent() runtime from O(n) to O(log n) am: e532af3f04 am: 587c48d59d

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

Change-Id: Id759f00736d90aea84cb14a3c1005af449f56250
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>