public Offset getHighWatermark() {
        return highWatermark;
    }
The information used to describe a finished snapshot split.
Copy from com.ververica:flink-cdc-base:2.3.0.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/source/meta/split/FinishedSnapshotSplitInfo.java