Add MemoryFormat callback (channels last)

[Pedrexus]

What does this PR do?

This PR fixes issue #15175 by adding a new feature to the ChannelsLast callback. This callback changes the module memory format on setup. This is useful when the user wants to use a different memory format and can lead to a considerable speedup in some cases.

Fixes #15175

This PR does not introduce any breaking changes.

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[Pedrexus]

Hello, all. I'm having trouble running make docs. I'd be glad if someone could help.

Error:
ModuleNotFoundError: No module named 'pt_lightning_sphinx_theme'

[awaelchli]

@Pedrexus This should get you started:

pip install -r requirements/pytorch/docs.txt
cd docs/source-pytorch
make html 
open ../build/html/index.html

Also, I left a comment here: #15175 (comment)

[Borda]

@Pedrexus, just thinking if the name is right, since it rather does ReorderImageDimensions

lets re-think the name