[Feat]: Dataset Tools add mask invert feature

[crapthings]

Describe your use-case.

• a toggle button that invert mask

learn background or learn foreground

i don't know if Unmasked probability, Unmasked Weight can do invert learning

What would you like to see as a solution?

ImageOps.Invert(input_image)

Have you considered alternatives? List them here.

No response