Data normalizers in burn-dataset

[antimora]

Feature description

Dataset package should provide with basic normalizer's, such standard score normal.

Feature motivation

Data normalization is a common operation and should be part of the library for convenience and less code writing for everyone.

(Optional) Suggest a Solution

1. For the starter, should add traits for data normalization.
2. Add standard score normalizer (across batch, features or the entire dataset).

And example how torch does: https://stackoverflow.com/questions/63746182/correct-way-of-normalizing-and-scaling-the-mnist-dataset

[caiopiccirillo]

Hi! Is anyone working on this? If not, can I do it?

[antimora]

@CaioPiccirillo, please go ahead. I am assigning it to you.