OffsetCommit Response and fixed multiple issues including segfaults

- Added error handling to ConsumerGroupHeartbeat API
- Added type new errors - UNRELEASED_INSTANCE_ID and UNSUPPORTED_ASSIGNOR
- Added partial acknowledgement flow
- Upgraded OffsetCommit Request and response to v9
- Fixed metadata being called with duplicate topic id
- Fixed next_target_assignment not getting reset to NULL
- Fixed member stuck if fenced during rebalancing
- Fixed segfault with current and target assignment while resetting consumer group
- Fixed segfault due to deleted topic in metadata
- Fixed leave not being called if the consumer without any assignment leaves