feat: allow logging the SQL query to stderr

- Logs the main SQL query when `log-query=main-query`.
- Only logs at the current `log-level`.

test/io/configs/expected/no-defaults-with-db-other-authenticator.config

@@ -25,6 +25,7 @@ jwt-secret = "ODERREALLYREALLYREALLYREALLYVERYSAFE"
 jwt-secret-is-base64 = false
 jwt-cache-max-lifetime = 7200
 log-level = "info"
+log-query = "main-query"
 openapi-mode = "disabled"
 openapi-security-active = false
 openapi-server-proxy-uri = "https://otherexample.org/api"