feat: add nameservers option for custom name servers (equivalent of --dns.resolvers in Lego)
#18
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This PR adds an option
--dns-multi-nameserversthat accepts a comma-separated list of recursive name servers to be used for ACME. This is useful for split DNS, where the system DNS resolution may diverge with a public DNS.Alternatively we can add an option to enforce the use public DNS (most commonly DoT/DoH), but that is less flexible and we need to determine which public DNS to trust.