Examples/Tutorials for training TF GNN models using GPU based on sampling with graphscope.learning

[sighingnow]

Is your feature request related to a problem? Please describe.

Obviously, it is supported, but it would be nice if we could have some tutorials/notebooks to show the capability.

It doesn't require much engineering effort but does need some crafting and testing work on existing GNN tutorials.

Additional context Add any other context or screenshots about the feature request here.