Group Instance ID support

[yawhide]

are y'all planning to add group.instance.id support? I dont see anything in the consumer constructor docs about this here: https://github.com/platformatic/kafka/blob/main/docs/consumer.md#constructor

kip: https://cwiki.apache.org/confluence/display/KAFKA/KIP-345%3A+Introduce+static+membership+protocol+to+reduce+consumer+rebalances

[ShogunPanda]

It is not in the immediate roadmap. Would you like to send a PR?