torch gibbs and kspace noise

[rijobro]

Hi @rijobro ,

I am checking the left transforms, seems these 4 intensity transforms already execute with Tensor data, but the code stype doesn't follow our backend design:
"GibbsNoise",
"RandGibbsNoise",
"KSpaceSpikeNoise",
"RandKSpaceSpikeNoise",
Do you also plan to add backend support for them in v0.7?

Thanks in advance.

Originally posted by @Nic-Ma in #2971 (comment)

[rijobro]

@Nic-Ma In the big PR, I made the FFT and invFFT compatible with both torch and numpy input. So these transforms will support both numpy and torch input without needing to convert.

[Nic-Ma]

Cool, that's great!

Thanks.