dataTransforms: Add function to scale data

[lizzthabet]

The function will take raw, filtered data points and scale them to the same size canvas. This means that the strokes of a large circle and a small circle, if they have the same proportions, will map to the same space on the scaled canvas. This function will help make our data more legible to the machine.

[cofuente]

Possibly using Scalar from TensorFlow.js with zero mean and one unit