Merge "Implement android::String access methods that avoid C string cast" into main am: 771bda6c0b am: 2b3630be4d

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2748673

Change-Id: I4e5a8527303ce04484a46c3e21cae56c73f0aa04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>