Function connect 

pub fn connect<T, U>(
    server: T,
    client: U,
) -> impl Future<Output = Result<ConnectedServices<T, U>, ConnectError>>
where
    T: Service<RoleServer>,
    U: Service<RoleClient>,

Helper function to connect an MCP server and client via in-memory transport This handles the dual-era discovery/initialization handshake by running both concurrently