Apache kafka 14147

[shiva2405]

Description

We need to provide the functionality for an explicit LeaveGroup request to handle removing members from a group within the new generic group coordinator infrastructure.

Acceptance Criteria:

1. Handle the LeaveGroup request: Build the core logic to remove members from a group when they issue an explicit LeaveGroup request.
2. Scheduling: The CoordinatorRuntime write operation should be named "generic-group-leave".
3. Core API Methods: Add the public method public CoordinatorResult<LeaveGroupResponseData, Record> genericGroupLeave(RequestContext context, LeaveGroupRequestData request) to GroupMetadataManager.
4. Shard Layer Wrapper: Add the corresponding wrapper method public CoordinatorResult<LeaveGroupResponseData, Record> genericGroupLeave(RequestContext context, LeaveGroupRequestData request) in GroupCoordinatorShard.java.
5. Static members: When processing members, if the memberId is undefined (UNKNOWN_MEMBER_ID), fallback to checking if a groupInstanceId is provided to remove static members. If neither is valid, return an UNKNOWN_MEMBER_ID error.
6. Validation: In the top-level GroupCoordinatorService#leaveGroup implementation, immediately reject empty or invalid group IDs with an INVALID_GROUP_ID error.