DomainInfo should accept authInfo data

[nrempel]

https://datatracker.ietf.org/doc/html/rfc5731#section-3.1.2

e.g.,

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
    <command>
        <info>
            <domain:info xmlns:domain="urn:ietf:params:xml:ns:domain-1.0">
                <domain:name hosts="all">example.com</domain:name>
                <domain:authInfo>
                    <domain:pw>2fooBAR</domain:pw>
                </domain:authInfo>
            </domain:info>
        </info>
        <clTRID>ABC-12345</clTRID>
    </command>
</epp>