[Feature request]: Labels for p5.NetGraph

[matiasvlevi]

We could add an option for p5.NetGraph that allows us to display information

here is what we could potentially display:

• Layer labels (input, hidden, output)
• output values next to the output neurons.
• input values next to the input neurons.
• a model's epoch with the nn.epoch property.
• a model's loss with the nn.loss property

Here are some example of what it could look like

graph.displayLayers();
graph.displayOutput();
graph.displayInput();
graph.displayEpoch();
graph.displayLoss();