public int getRequestMetaGroupId() {
        return requestMetaGroupId;
    }
The {@link SourceEvent} that {@link IncrementalSourceReader} sends to {@link
IncrementalSourceEnumerator} to pull change log metadata, i.e. sending {@link
StreamSplitMetaEvent}.
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/events/StreamSplitMetaRequestEvent.java