create pay-to-key-hash (P2PKH) script

def p2pkh_script(network: str, address: str) -> P2pkhScript:
    '''create pay-to-key-hash (P2PKH) script'''

    network_params = net_query(network)

    addr = Address.from_string(network=network_params,
                               string=address)

    return P2pkhScript(addr)