Graph augmentations.

[Pwhsky]

Added graph augmentations for training MAGIK in the form of callable classes.

[BenjaminMidtvedt]

@Pwhsky Some of these augmentations are highly tracking-centric. Specifically flipping/translating/rotating nodes makes sense if the nodes contain XY positions. This is fine, but it should be clear from the naming, and I would suggest having all 2d tracking augmentations in a separate file.

I'd also homogenize the names. I'd suggest Node[Action], Edge[Action], e.g. NodeNoise, EdgeDropout.

Also, for a general noise augmentation, I'd expect more control over the distribution of the noise. I'd even have NodeNormalNoise, NodeUniformNoise, NodePoissonNoise etc.

In fact, looking at it deeper, I think all of the classes need to be able to be parameterized.

[Pwhsky]

Thank you for the feedback, I will implement what you suggested so it is both more general and customizable for what the user needs.