Migrate 25 crates to monorepo. am: de33b35bbb

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/regex-syntax/+/3249332

Change-Id: Ifc4e8b865c46db18a048de2de5b8feee3986093c
Signed-off-by: Automerger Merge Worker <[email protected]>