chore: add TypeTSIG/RcodeMask constants, remove dead code, refactor FORMERR builder

[PhantomInTheWire]

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📥 Commits

Reviewing files that changed from the base of the PR and between 5ee5fbb and e1b981d.

📒 Files selected for processing (8)

• internal/dns/message.go
• internal/dns/response.go
• internal/dns/ttl.go
• internal/dns/util.go
• internal/resolver/recursive.go
• internal/resolver/utils.go
• internal/server/udp.go
• internal/server/utils.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cleanup/dns-constants

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