Function spl_stake_pool::instruction::add_validator_to_pool_with_vote

pub fn add_validator_to_pool_with_vote(
    program_id: &Pubkey, 
    stake_pool: &StakePool, 
    stake_pool_address: &Pubkey, 
    vote_account_address: &Pubkey
) -> Instruction

Create an AddValidatorToPool instruction given an existing stake pool and vote account