Added long running query tag

- Now if queries run for longer than 0.5 s, a tag will be appended to the log [LONG RUNNING QUERY]
- If app.db_log_only_long is set to true in the .env file, the db log will only show long running queries.

app/Config/App.php

@@ -28,6 +28,13 @@ class App extends BaseConfig
 	 */
 	public $db_log_enabled = false;
 
+	/**
+	 * DB Query Log only long running queries
+	 *
+	 * @var bool
+	 */
+	public $db_log_only_long = false;
+
 	/**
 	 * Defines whether to require/reroute to HTTPS
 	 *