public Iterator<SourceRecord> iterator() {
        return sourceRecords.iterator();
    }
Data structure to describe a set of {@link SourceRecord}.
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/SourceRecords.java