liburingutils: Add unit tests am: f3d7706e7b am: 052d70b3d8

Original change: https://android-review.googlesource.com/c/platform/system/liburingutils/+/3536896

Change-Id: I5f89c2f0625f0599079c981a79c4e7539bbd3755
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>