Migrate 25 crates to monorepo. am: 5a81d77be4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/darling_core/+/3241404

Change-Id: I45051d690e98f9ee83a6d19f607d6965b01aa3f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>