Add High-Availability Support

[oubiwann]

Tasks:

• Add Reconnection Support for all Subscribers - Add Reconnection Support for all Subscribers #67
• Update Scheduler API to use new Reconnection Support - Update Scheduler API to use new Reconnection Support #69
• Update Executor API to use new Reconnection Support - Update Executor API to use new Reconnection Support #71
• Update Operator API to use new Reconnection Support - Update Operator API to use new Reconnection Support #72
• Add Master Redirection Support - Add Master Redirection Support #68

Part of epic #2