add feature varnet

[GiannakopoulosIlias]

Added a new folder in fastmri_examples which includes the new modules for feature varent and ablations.
Added a new model file (feature_varnet) in fastmri/models which includes the new models.
Updated markdowns to include the new reference.

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[mmuckley]

Mostly asking for small reformatting items.

[mmuckley]

Also @GiannakopoulosIlias it looks like the PR is failing some linter tests. Could you also fix those?

[mmuckley]

@GiannakopoulosIlias some tests still aren't passing. Please make sure you're using the correct version of black on your code.

[mmuckley]

@GiannakopoulosIlias the message about Jupyter can be ignored. You only need to pip install black with the right version listed in the message.

[GiannakopoulosIlias]

@GiannakopoulosIlias the message about Jupyter can be ignored. You only need to pip install black with the right version listed in the message.

Should be okay now, thanks!

[mmuckley]

Hello @GiannakopoulosIlias, now it looks like there are errors with type annotations with mypy.

If there are too many to deal with, you could move feature_varnet.py into the examples folder. Then you should be able to commit the code without fixing everything.

[GiannakopoulosIlias]

Hello @GiannakopoulosIlias, now it looks like there are errors with type annotations with mypy.

If there are too many to deal with, you could move feature_varnet.py into the examples folder. Then you should be able to commit the code without fixing everything.

I will try to adjust them tomorrow. They look many but I think most of them are the same error for all different model ablations.