add PyTorch integration support

[kshitij12345]

Before submitting checklist

• Did you update the CHANGELOG? (not for test updates, internal changes/refactors or CI/CD setup)
• Did you ask the docs owner to review all the user-facing changes?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.06 🎉

Comparison is base (5af917b) 79.53% compared to head (e98cab6) 79.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1337      +/-   ##
==========================================
+ Coverage   79.53%   79.60%   +0.06%     
==========================================
  Files         275      276       +1     
  Lines       13517    13524       +7     
==========================================
+ Hits        10751    10766      +15     
+ Misses       2766     2758       -8     

Flag	Coverage Δ
py3.7	72.98% <0.00%> (-6.09%)	⬇️
py3.9	?
ubuntu	72.98% <0.00%> (-6.42%)	⬇️
unit	72.98% <0.00%> (-0.73%)	⬇️

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Impacted Files	Coverage Δ
src/neptune/integrations/pytorch/__init__.py	0.00% <0.00%> (ø)

... and 13 files with indirect coverage changes

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