Add logging for DNS Filter

Title: Add access logging for DNS Filter

Description: We'd like Envoy to act as DNS for our services. DNS logs are a rich source of telemetry data for security detection and visibility on outbound requests. It would be great if we had the option to log both local and external resolutions. The DNS filter currently provides debug application logging for external resolutions, but we'd want to extend the filter to provide access logging for both local and external resolves.