Function spl_stake_pool::instruction::add_validator_to_pool

pub fn add_validator_to_pool(
    program_id: &Pubkey, 
    stake_pool: &Pubkey, 
    staker: &Pubkey, 
    stake_pool_withdraw: &Pubkey, 
    validator_list: &Pubkey, 
    stake_account: &Pubkey
) -> Instruction

Creates AddValidatorToPool instruction (add new validator stake account to the pool)