Low-level Server support for mcp dev and mcp run command

Currently the mcp dev and mcp run command does not support the low-level Server class. I think it's a better developer experience if we support both classes for these 2 commands, assuming there's no inherent reason for not doing so.

I'm interested in adding support for the low-level Server to both mcp dev and mcp run and I would like seek the maintainer's guidance on this. It looks like the only thing missing is the dependencies field, which is pulled from the Settings class and does not exist in the low-level Server. I'm thinking about adding a similar Settings class to server/lowlevel/server.py and thus introducing the dependencies field. The downside is more complexity in server/lowlevel/server.py which I'm not sure if it's acceptable to the maintainers and falls in line with the long term roadmap for the code base.

Please advise. Thanks.

Inizia tracciando i punti di ingresso dei comandi mcp dev e mcp run e confronta il modo in cui gestiscono le classi Server di alto e basso livello. Leggi server/lowlevel/server.py e la classe Settings esistente per comprendere il campo dependencies mancante. Il lavoro è completato quando i maintainer hanno concordato il design e il supporto per Server di basso livello in entrambi i comandi è stato verificato.