add Char column type

[dantownsend]

Related to #364

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.59%. Comparing base (144faba) to head (b50a6a0).
⚠️ Report is 585 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #368   +/-   ##
=======================================
  Coverage   90.59%   90.59%           
=======================================
  Files         127      127           
  Lines        6411     6412    +1     
=======================================
+ Hits         5808     5809    +1     
  Misses        603      603           

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