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/boolean-string.config

@@ -25,6 +25,7 @@ jwt-secret = ""
 jwt-secret-is-base64 = true
 jwt-cache-max-lifetime = 0
 log-level = "error"
+log-query = "disabled"
 openapi-mode = "follow-privileges"
 openapi-security-active = false
 openapi-server-proxy-uri = ""