Error checks added to ImageNet VGG

[sarthakpati]

Fixes #N.A.

Proposed Changes

• vgg11 and vgg13 pre-trained added
• error check for 2d
• module renamed for clarity and possible future extensions with other models

Checklist

• I have read the CONTRIBUTING guide
• My PR is based from the current GaNDLF master
• Non-breaking change (would not break existing functionality): please provide as many details as possible for any breaking change
• Function/class source code documentation added/updated
• Code has been blacked for style consistency
• If applicable, version information has been updated in GANDLF/version.py
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file
• Usage documentation has been updated, if appropriate
• History has been updated, if appropriate
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3,4]

[dagshub]

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[codecov]

Codecov Report

Merging #377 (a1bfbac) into master (e504164) will increase coverage by 0.14%.
The diff coverage is 91.01%.

@@            Coverage Diff             @@
##           master     #377      +/-   ##
==========================================
+ Coverage   91.54%   91.69%   +0.14%     
==========================================
  Files          93       93              
  Lines        5394     5442      +48     
==========================================
+ Hits         4938     4990      +52     
+ Misses        456      452       -4     

Flag	Coverage Δ
unittests	91.69% <91.01%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
testing/test_full.py	98.26% <ø> (ø)
GANDLF/models/imagenet_vgg.py	90.90% <90.90%> (ø)
GANDLF/models/__init__.py	100.00% <100.00%> (ø)

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