Add reward property in the chain state

[shuse2]

Description

Add a reward of last block without deduction by BFT or DPoS violation in the chain state.

{
  chain: {
    lastBlockHeader: BlockHeader,
    lastReward: bigint,
  },
}

Motivation

In order to reward the sender of PoM transaction, the reward information is required.

Acceptance Criteria

• Reward is added in the property of chain state
• Updated transaction package type of state store