Migrate 25 crates to monorepo. am: eacd222621 am: 2b2231c2c1

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/smallvec/+/3249090

Change-Id: I5b63909e2a4892cec1ccec3994163af498ccd23f
Signed-off-by: Automerger Merge Worker <[email protected]>