Migrate 25 crates to monorepo. am: c1e098eba2

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand/+/3249331

Change-Id: Ied5e751580891fa235348f2361ca005db7539a49
Signed-off-by: Automerger Merge Worker <[email protected]>