Move parsers and formatters into rustutils library. am: cd5989ac35

Original change: https://android-review.googlesource.com/c/platform/system/librustutils/+/2942467

Change-Id: I400916a87ac17d6bb847d1f8dd989447dc1dfee8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>