* NIFI-10975 Added Kubernetes Leader Election and State Provider
- Added Kubernetes Leader Election Manager based on Kubernetes Leases
- Added Kubernetes State Provider based on Kubernetes ConfigMaps
- Added nifi-kubernetes-client for generalized access to Fabric8 Kubernetes Client
- Added nifi.cluster.leader.election.implementation Property defaulting to CuratorLeaderElectionManager
- Refactored LeaderElectionManager to nifi-framework-api for Extension Discovering Manager
- Refactored shared ZooKeeper configuration to nifi-framework-cluster-zookeeper
* NIFI-10975 Updated Kubernetes Client and StateMap
- Upgraded Kubernetes Client from 6.2.0 to 6.3.0
- Added getStateVersion to StateMap and deprecated getVersion
- Updated Docker start.sh with additional properties
* NIFI-10975 Corrected MockStateManager.assertStateSet()
* NIFI-10975 Upgraded Kubernetes Client from 6.3.0 to 6.3.1
* NIFI-10975 Corrected unregister leader and disabled release on cancel
* NIFI-10975 Corrected findLeader handling of Lease expiration
- Changed LeaderElectionManager.getLeader() return to Optional String
* NIFI-10975 Corrected StandardNiFiServiceFacade handling of Optional Leader
* NIFI-10975 Changed getLeader() to call findLeader() to avoid stale cached values
* NIFI-10975 Updated LeaderElectionCommand to run LeaderElector in loop
* NIFI-10975 Rebased on project version 2.0.0-SNAPSHOT
* NIFI-10975 Corrected Gson and AspectJ versions
- Updated versions to match current main branch and avoid reverting
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