demote value and sample columns from events.tsv from optional to arbitrary

[sappelhoff]

follows:

• [FIX] Demote sample and value columns in events.tsv from OPTIONAL to arbitrary bids-specification#1457

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e22ee36) 83.28% compared to head (48c0a59) 83.28%.

❗ Current head 48c0a59 differs from pull request most recent head 148ed28. Consider uploading reports for the commit 148ed28 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1649   +/-   ##
=======================================
  Coverage   83.28%   83.28%           
=======================================
  Files          92       92           
  Lines        3799     3799           
  Branches     1171     1171           
=======================================
  Hits         3164     3164           
  Misses        537      537           
  Partials       98       98           

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