[Feature request]: 2D Value Graph

[matiasvlevi]

We already have a neural network graph, but how about a 2d graph for values suck as accuracy of loss?

Here are some examples of what I had in mind :

Creation

let graph = new p5.valueGraph(x, y, w, h);

updating/adding a value to the curve

graph.update('accuracy', acc);
graph.update('loss', loss);

Customizing appearance, it would be nice to use the same themes as p5.NetGraph

graph.setTheme(CLASSIC);

The graph should also change its bounds once a value breaks through the current bounds in order to keep the last value added visible

Here is an example of what the 2d graph could look like: