Better debug logging for HTTP requests parsing

[maxdml]

Today, it isn't possible to print the body or headers of an HTTP request, before they are parsed with DBOS HTTP handler wrappers. It would be very useful to enable this when logLevel=debug.

Of course this needs a warning in the documentation: headers / body could contain secrets that should not be captured by the telemetry export infrastructure.

[qianl15]

Today we can use KoaMiddleware https://docs.dbos.dev/api-reference/decorators#koamiddleware to achieve this.

[maxdml]

Yes but really not convenient and intuitive. It would be so much easier to configure the log level to debug and have these information available, than having to write a decorator, re build the app, etc