did it have a methed called 'fetch_consumer_group_offsets' ? #659
Description
i want know a group_id has consumed how many offset on a topic.
let offsets = admin_client.fetch_consumer_group_offsets(group_id, &[topic_name.to_string()], None).await?;
in java,we have:
kafkaAdminClient.listConsumerGroupOffsets(group_id).partitionsToOffsetAndMetadata().get();