Wrong matching of delta and postimage rows in batches in POST_IMAGE mode

The POST_IMAGE mode of replicator when it encounters a INSERT or UPDATE CDC log row, it "suspends" replication of such row, instead waiting for POST_IMAGE row. When it finds a matching POST_IMAGE row it performs the insert/update with the data in POST_IMAGE row.

However, matching the delta row and postimage row is not done correctly for batches (of more than 1 operation). The matching is done by remembering the last operation type (its handler) for a stream id. But if there was a batch:

INSERT
UPDATE
POST_IMAGE
POST_IMAGE

then the first POST_IMAGE will match to the UPDATE, not the INSERT. The state should probably remember a queue of operation handlers, not only the last one:

https://github.com/scylladb/scylla-cdc-java/blob/avelanarius-changes/scylla-cdc-replicator/src/main/java/com/scylladb/cdc/replicator/operations/postimage/PostImageState.java