Is your feature request related to a problem? Please describe. 🐛

While working on this plugin I have had difficulty working with logs due to:

• Multiple per request logs are sent to the output, when the plugin is in use, this makes the amount of logging generated unbearable
• There is no clear distinction between the middleware log's and traefik's actual logs
• No structured log format (i.e. JSON) so that logs can be easily manipulated and ingested into logging services

Describe the solution you'd like ✨

• Use the slog library, with an additional TRACE log level
• Change debug level of logs that run on every request