Move parsers and formatters into rustutils library. am: a044e94482

Original change: https://android-review.googlesource.com/c/platform/system/tools/sysprop/+/2943766

Change-Id: Ida6dbaae7498f0e61c16f0be4fae650e959af964
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>