add substitution for functional linear

[itai-berman]

Pull Request Description:

Add substitution support from functional linear layer to Linear in Pytorch.

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).

[elad-c]

what about torch.nn.functional.conv2d and it's friends?

[itai-berman]

It seems that you already handled both Conv2d and ConvTranspose2d FunctionalConvSubstitution and also FunctionalBatchNorm, FunctionalLayerNorm were handled

[haihabi]

@itai-berman, please add Description to the PR