QueryDelegationRewards queries a delegation rewards between a delegator and a validator.
QueryDelegatorValidators returns delegator's list of validators it submitted delegations to.
QueryValidatorCommission returns a validator's commission.
WithdrawAllDelegatorRewards builds a multi-message slice to be used to withdraw all delegations rewards for the given delegator.
WithdrawValidatorRewardsAndCommission builds a two-message message slice to be used to withdraw both validation's commission and self-delegation reward.