DNS Error Reporting (RFC 9567) (#902)

DNS Error Reporting (RFC 9567) (#902)

* v1 EDER poc

* remove superfluous edns_list_get_option function

* create an EDER configurable

* Hackathon 114

* Fixes for version -04

* Generated configparser and configlexer are not versioned in master anymore

* Remove NOERROR DNS Error Reporting; not part of final RFC.
* Use assigned IANA EDNS0 Option Code for Report-Channel.

* Fix buffer protection and agent domain validity

* Use DNS Error Reporting instead of the eder nickname

* Update documentation.

* Fix typo.

* Bail out early if ede is not present.

* Forget previous EDNS options from upstream; this is what was
  implicitly happening but not deterministacally.

* Don't report LDNS_EDE_OTHER and bail early if there is no reporting
  agent.

* Only do DNS error reporting when a client asked for something that
  went wrong.

* Add an error reporting agent in the parent that should be ignored.

* review feedback.

* fixup for fast reload

* Add 'num.dns_error_reports' to stats and test for it.

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Co-authored-by: TCY16 <tom@nlnetlabs.nl>
Co-authored-by: Yorgos Thessalonikefs <yorgos@nlnetlabs.nl>