Update DPoS endpoints

[shuse2]

Description

• getGovernanceTokenID
  Obtain from module config
  Res

{
  tokenID: 'hex string'
}

• getValidatorsByStake
  Obtain from eligibleDelegateStore and delegateStore

Req

{
limit?: number, 
}

Res

{
  validators: [{
      address: lisk32,
      name: string;
	totalVotesReceived: bigint;
	selfVotes: bigint;
	lastGeneratedHeight: number;
	isBanned: boolean;
	pomHeights: number[];
	consecutiveMissedBlocks: number;
  }]
}

• getLockedRewards

Req

{
  address: lisk32 
  tokenID: 'hex string',
}

Res

{
  reward: 'number string',
}

• getLockedVotedAmount

Req

{
  address: lisk32 
}

Res

{
  amount: 'number string',
}

Ref: https://github.com/LiskHQ/lips/blob/main/proposals/lip-0057.md#getlockedvotedamount

Acceptance Criteria

• All endpoints are covered by unit tests

Additional Information

For getClaimableRewards and getLockedRewards the definitions are in proposed LIP