Function scan_iceberg_metadata 

pub fn scan_iceberg_metadata(
    table: Table,
    metadata_type: IcebergMetadataTableType,
    time_travel_info: Option<IcebergTimeTravelInfo>,
    chunk_size: usize,
) -> impl Stream<Item = Result<DataChunk, ConnectorError>>

Read one Iceberg metadata relation and emit bounded DataChunks.