fix(checks): Sort columns.onset numerically

[effigies]

Type coercion should not be assumed for TSV columns, as it may not be efficient. Therefore we should add a sorting method to determine whether something should be sorted lexically, numerically, or type-dependently (default).

This is implemented in the BIDS validator: bids-standard/bids-validator#2022

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.04%. Comparing base (1418ce8) to head (63f8d8f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1871   +/-   ##
=======================================
  Coverage   88.04%   88.04%           
=======================================
  Files          16       16           
  Lines        1380     1380           
=======================================
  Hits         1215     1215           
  Misses        165      165           

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