public PulsarSourceBuilder<OUT> setStartCursor(StartCursor startCursor) {
        this.startCursor = checkNotNull(startCursor);
        return this;
    }
Specify from which offsets the PulsarSource should start consume from by providing an {@link
StartCursor}.

@param startCursor set the starting offsets for the Source.
@return this PulsarSourceBuilder.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/pulsar/src/main/java/org/apache/inlong/sort/pulsar/source/PulsarSourceBuilder.java