text: Title: load_dataset() does not support tsv
  Body: ### Feature request
  
  the load_dataset() for local functions support file types like csv, json etc but not of type tsv (tab separated values).
  
  ### Motivation
  
  cant easily load files of type tsv, have to convert them to another type like csv then load
  
  ### Your contribution
  
  Can try by raising a PR with a little help, currently went through the code but didn't fully understand