Function start_indexer_writer_for_testing

pub async fn start_indexer_writer_for_testing(
    db_url: String,
    snapshot_config: Option<SnapshotLagConfig>,
    retention_config: Option<RetentionConfig>,
    data_ingestion_path: Option<PathBuf>,
    cancel: Option<CancellationToken>,
    start_checkpoint: Option<u64>,
    end_checkpoint: Option<u64>,
) -> (PgIndexerStore, JoinHandle<Result<(), IndexerError>>, CancellationToken)

Wrapper over Indexer::start_writer_with_config to make it easier to configure an indexer writer for testing. If the config options are null, default values that have historically worked for testing will be used.