Modernise replicator to use new APIs #41
Description
In this commit: 77abc23, getUnsafeBytes was introduced back. This API could make the replicator source code easier, eliminating the need to translate between different representations.
Additionally, the replicator now manually groups delta rows with pre/post-image. When a new API is introduced that performs this pairing automatically, the replicator should be switched to use this API.