Moved CMAKE_CXX_STANDARD from 14 to 17

[ipcamit]

This moves the CMAKE_CXX_STANDARD from 14 to 17. Without is the libtorchsparse is triggering libtorch CXX 17 required error.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.09%. Comparing base (2d55981) to head (517a310).
Report is 5 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #396   +/-   ##
=======================================
  Coverage   73.09%   73.09%           
=======================================
  Files          29       29           
  Lines        1171     1171           
=======================================
  Hits          856      856           
  Misses        315      315           

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