ConstReadonlydigest: typeof ros2TypeHashDigestReturns the 32-byte digest a RIHS01_ string carries, or null if the
string is malformed.
ReadonlyentityKey: typeof ros2EntityKeyBuilds the Zenoh key an rmw_zenoh peer publishes an entity on, or null
if the name, type, or hash is not usable.
The RIHS type hash that identifies a message definition.