feat(node): new voting reactor state machine

[cryptoAtwill]

As part of topdown enhancement, the following updates are added to vote tally in this PR:

• Using tokio single thread reactor mode
• Introduce operation mode state machine skeleton with Active and Paused operation mode.

The state machine is as follow:

stateDiagram-v2
  [*] --> Paused : Process start
  Paused --> Active : Synced
  Active --> Recovery : Checkpoints quiet
  Recovery --> Active : Checkpoints observed
  Active --> Paused : Stopping
  Recovery --> Paused : Stopping
	
  state Recovery {
    [*] --> SoftRecovery
    SoftRecovery --> HardRecovery : Still no new topdown checkpoints
    SoftRecovery --> [*] : New checkpoints
    HardRecovery --> [*] : New checkpoints
  }

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