Release 1.8.0: fill the gaps found in the Esselink-nu and NoorDigitalAgency forks

[ademar]

Summary

I went through all 33 forks for work that never came back upstream. Two had changes still missing from master. This PR reimplements them so existing code keeps compiling, and credits both forks.

• Host info can be read (from @NoorDigitalAgency, eb86c49). HostInfoResponse.Host was protected, so callers couldn't reach the parsed host; the library's own test was disabled for that reason. It now has a public getter.
• Transfer responses are complete (from @Esselink-nu, f033d0d). DomainTransferResponse looked for domain:expDate, but RFC 5731 names it domain:exDate, so ExpirationDate was always null. It now reads exDate, keeping expDate as a fallback. It also reads the elements RFC 5731 requires in every transfer response, into TransferStatus, RequestClientId, RequestDate, ActionClientId and ActionDate.
• Name servers as host attributes (from @Esselink-nu, ecba914). This is the hostAttr form, with glue addresses:
  • New DomainHostAttribute class.
  • New DomainCreate.NameServerAttributes and EppDomainUpdateAddRemove.NameServerAttributes, alongside the existing string lists. The fork changed NameServers' type and forced hostAttr for everyone, which would break existing callers, so this adds them side by side instead.
  • Mixing host objects and host attributes in one domain:ns throws, as RFC 5731 allows only one form.
  • Info responses keep the addresses in Domain.NameServerAttributes, also filled for the Nominet and IIS info responses.
• PollResponse.DomainName for notifications (from @NoorDigitalAgency, 7663881). It now falls back to the domain-1.0 name element in the message. That covers standard panData/trnData notifications as well as IIS updateNotify, deleteNotify and transferNotify, which the fork handled one by one. None of the Nominet notification fixtures use that namespace, so their behavior is unchanged.

Both forks are added to CONTRIBUTORS. The other fork changes (DNSSEC info, TLS 1.2, netstandard2.0, a test fixture) are already in master through 1.4.0–1.7.0.

Version bumped to 1.8.0. The changes add API and change no existing signatures.

Testing

• Three Inconclusive placeholders are now real tests: TestHostInfoResponse1, TestDomainTransferQueryResponse1 and TestDomainTransferRequestResponse1.
• New tests cover hostAttr in create and update, rejecting mixed forms, parsing hostAttr from info responses, and DomainName from the RFC panData fixture and from an IIS updateNotify.
• 77 passed, 19 skipped (previously 22 skipped), in UTC and Asia/Tokyo.

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