Fix rate-limit whitelist handling - #8415
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Closes #8349.
This passes the configured rate-limit whitelist into the dnsproxy rate-limit middleware. Each whitelisted IP is converted to a full-length prefix, so repeated UDP requests from that address bypass the rate limiter while other clients still use the configured per-subnet buckets.
Testing:
go test ./internal/dnsforward -run '^TestNewRatelimitMw_ratelimitWhitelist$' -count=1\n-go test ./internal/dnsforward -count=1\n-go vet ./internal/dnsforward\n-go tool gofumpt --extra -e -l internal/dnsforward/config.go internal/dnsforward/config_internal_test.go\n-git diff --check