chore: fix README, remove dead code, centralise constants, extract tracer types

[PhantomInTheWire]

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📥 Commits

Reviewing files that changed from the base of the PR and between b2889a9 and 8510f43.

📒 Files selected for processing (10)

• README.md
• internal/cache/ttl.go
• internal/obs/tracer.go
• internal/obs/tracer_noop.go
• internal/pool/bytes.go
• internal/resolver/cache.go
• internal/resolver/constants.go
• internal/resolver/recursive.go
• internal/resolver/utils.go
• internal/server/utils.go

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