Introduces the share coordinator. This coordinator is built on the new coordinator runtime framework. It
is responsible for persistence of share-group state in a new internal topic named "__share_group_state".
The responsibility for being a share coordinator is distributed across the brokers in a cluster.
Reviewers: David Arthur <mumrah@gmail.com>, Andrew Schofield <aschofield@confluent.io>, Apoorv Mittal <apoorvmittal10@gmail.com>
There is a lot of code in group-coordinator which is not share/consumer/classic group specific.
Since we are introducing a share-coordinator as part of KIP-932 (in a new module), it would make sense to get the common coordinator functionality into a separate common coordinator module so that share-coordinator need not depend on group-coordinator.
Reviewers: Apoorv Mittal <apoorvmittal10@gmail.com>, David Jacot <djacot@confluent.io>, Andrew Schofield <aschofield@confluent.io>, Jeff Kim <jeff.kim@confluent.io>, Chia-Ping Tsai <chia7712@gmail.com>
Sushant Mahajan