Refactoring `ColorJitter` and `ColorJiggle` into smaller components

🚀 Feature

ColorJitter and ColorJiggle currently are too packed. It is better to develop smaller components and rewrite these as compositions of smaller components.

Motivation

Smaller components can be applied individually. For e.g., brightness and contrast jitterings are applicable to gray images, but currently they are under ColorJitter and ColorJiggle which are not applicable to gray images.

Pitch

class BrightnessJitter(...):
    ...


class ContrastJitter(...):
    ...


class HueJitter(...):
    ...


class ColorJitter(nn.Sequential):
    def __init__(...):
        self.brightness_jitter = BrightnessJitter(...)
        self.contrast_jitter  = ContrastJitter(...)
        self.hue_jitter = HueJitter(...)
        ...

[justanhduc]

@edgarriba I think I can work on a PR if it’s not too urgent.

[edgarriba]

I like the names such RandomBrightness , RandomContrast, etc. it goes according with other ops in the module