add PermuteChannels transform

[pmeier]

Closes #7620. I need to add proper test for the functionals. Happy to bikeshed on the name. I went with permute_channels, because that is what we had before. But "shuffle channels" as proposed in #7620 is also an option.

cc @vfdev-5

[pytorch-bot]

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[NicolasHug]

I'd rather just call it ChannelShuffle for consistency with the other package

[NicolasHug]

Thanks @pmeier , approving to unblock with a few comments

I'd rather just call it ChannelShuffle for consistency with the other package

I'm taking this back because of what it would mean for the functional name... All options seem to have some rather annoying downside. I'll let you decide.