Declarative, high-level MCP server API

Just like the Python SDK integrates FastMCP https://github.com/modelcontextprotocol/python-sdk/pull/106
I think the TypeScript SDK can also integrate [LiteMCP](https://github.com/wong2/litemcp) from the TypeScript ecosystem. It was inspired by FastMCP and offers a similar high-level API for developing MCP servers in TypeScript.