LOG_QUERIES has no effect anymore

[dpetrick]

Logging of queries has apparently been moved to metrics, which always emits query "log" events on debug: https://github.com/prisma/quaint/blob/main/src/connector/metrics.rs#L79

Unsure if this is a bug or intentional, so leaving the labeling to you. The LOG_QUERIES variable in the README doesn't do anything anymore.

On that note, mixing the query logging with the metrics implementation is an odd design choice and caused some confusion when I integrated quaint into a project.