text: Title: [ENH] add an expand_grid function
  Body: Recently watched a video by David Robinson on tidytuesday where he used the crossing function (a wrapper of the base r function expand_grid) from tidyr R library to do a Monte Carlo simulation.  I think this would a great addition to pyjanitor.  Don’t have the bandwidth at the moment to add it, but could in the near future.  I did come across a stackoverflow solution to this 
  
  https://stackoverflow.com/questions/12130883/r-expand-grid-function-in-python
  
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