PyTorch Profiler [WIP]

[guptaaryan16]

Fixes #1917
(uses #2315)

Description: Added check for minimum version of PyTorch for import. Now need to add tests for the Profiler

Check list:

• New tests are added (if a new feature is added)
• New doc strings: description and/or example code are in RST format
• Documentation is updated (if required)

[guptaaryan16]

Hey @vfdev-5 @sdesrozis I have added a check for minimum PyTorch version, Now I wanted to ask whether we should keep this profiler in the main module or in the contrib module as most of the handlers introduced afterwards were put there. Also what should be the additional tests that should be present in this handler?