[KAFKA-5027] Kafka Controller Redesign - ASF JIRA

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The goal of this redesign is to improve controller performance, controller maintainability, and cluster reliability.

Documentation regarding what's being considered can be found here.

relates to

KAFKA-1120 Controller could miss a broker state change

KAFKA-6029 Controller should wait for the leader migration to finish before ack a ControlledShutdownRequest

KAFKA-3083 a soft failure in controller may leave a topic partition in an inconsistent state

KAFKA-4444 Aggregate requests sent from controller to broker during controlled shutdown

KAFKA-5296 Unable to write to some partitions of newly created topic in 10.2

KAFKA-3038 Speeding up partition reassignment after broker failure

KAFKA-3436 Speed up controlled shutdown.

(2 relates to)

1.	cleanup javadocs and logging	In Progress	Ismael Juma
2.	response error code checking	Open	Unassigned
3.	KafkaZkClient request queue time metric	Open	Unassigned