public PulsarTopicFetcherBuilderImpl pulsarClient(PulsarClient pulsarClient) {
        this.pulsarClient = pulsarClient;
        return this;
    }
Builder of pulsar single topic fetcher.
inlong-sdk/sort-sdk/src/main/java/org/apache/inlong/sdk/sort/fetcher/pulsar/PulsarTopicFetcherBuilderImpl.java