Add an ability to trace requests

Expected Behavior

User can specify a file to dump information about all requests being sent between MCP server and the client

Current Behavior

I don't think there is a way to do it currently.

Context

We created a LoggingServletTransportProvider which does that, but with the new changes that no longer compiles since there is no public constructor. Using the builder and then composing is also not possible because the methods are protected.

We could upstream the LoggingServletTransportProvider or something along these lines if it makes sense.

This is very useful for debugging potential issues with MCP servers especially when users turn on automatic accept.

Inizia confrontando lo Scala LoggingServletTransportProvider collegato con il builder corrente del Java SDK e i relativi metodi di trasporto protetti. Determina come il tracing delle richieste possa esporre un file di output selezionato dall'utente senza fare affidamento su costruttori o metodi inaccessibili. Il lavoro è completato quando gli utenti possono configurare un file e visualizzare le informazioni sulle richieste scambiate tra il server MCP e il client.