Model Context Protocol support

[fanyang01]

https://www.anthropic.com/news/model-context-protocol

https://github.com/modelcontextprotocol/servers/blob/main/src/postgres/index.ts

[fanyang01]

https://github.com/apecloud/myduckserver/blob/main/docs/tutorial/mcp.md

MyDuck can work with the official Postgres MCP server seamlessly. The next step should be adding support for server-side MCP implementation, then potential users can use a MCP proxy (e.g., https://github.com/boilingdata/mcp-server-and-gw) to connect to MyDuck.