Migrate 25 crates to monorepo. am: 2095bf1f5f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand_chacha/+/3248528

Change-Id: Ic761aff63c8201ace5b01d453abc7e87432d66a2
Signed-off-by: Automerger Merge Worker <[email protected]>