High level local forward API

[tmds]

API proposal:

class SshClient
{
    // Starts a local server that accepts connections on bindEndpoint and forwards through the SSH connection to 'host:port'.
    // The forward is stopped if the connection is closed, or the returned instance gets Disposed.
    // BindEndpoint can be an IPEndPoint or a UnixDomainSocketEndPoint.
    Task<LocalForward> StartForwardTcpAsync(EndPoint bindEndpoint, string remoteHost, int remotePort, CancellationToken cancellationToken);
    Task<LocalForward> StartForwardUnixAsync(EndPoint bindEndpoint, string remotePath, CancellationToken cancellationToken);
}
class LocalForward : IDisposable
{
    EndPoint ServerEndPoint { get; }
}